Database Develop

Options for Unlocking AT&T Samsung Galaxy S5 GM-900A

Hey Everyone,
I need assistance with unlocking my smartphone; it's an AT&T Samsung Galaxy S5 GM-900A. I did a little research on the internet and it's my understanding that unlocking a Samsung smartphone linked with AT&T is a bit more difficult than it already is with other companies. I also saw a lot of sites that offer "unlocking" services for a certain price. Before I decide to do that, I wanted to know if there were any others options or which site is most reliable. From what I've seen and read, it seems that this forum is the best option for seeing if this is possible. Appreciate any assistance you guys can offer.

I am not familiar with unlock sites but have heard mixed reviews on them. Those sites can only unlock the sim card, not the boot loader. Just thought I would put that out there since you didn't specify what kind if unlock you were looking for. I recently submitted a sim unlock through AT&T for my s5 since I am out of contract.

johnkirchner said:
I am not familiar with unlock sites but have heard mixed reviews on them. Those sites can only unlock the sim card, not the boot loader. Just thought I would put that out there since you didn't specify what kind if unlock you were looking for. I recently submitted a sim unlock through AT&T for my s5 since I am out of contract.
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Unfortunately, mine is still under contract but I would like to unlock my smartphone so it can be used with another carrier. This is the type of unlock service those sites are saying they can provide, right? I've also read and heard mixed reviews on the internet, which is why I came here in hopes that I can get additional info on this. Thanks for your prompt response.

Just use att they will unlock your sim

Andrew K. Sterling said:
Unfortunately, these services can't unlock the bootloader, as far as I know.
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What's the difference between that and sim unlocking? Any disadvantages on just having the sim unlocked and not the bootloader?
Andrew K. Sterling said:
I've unlocked several Samsungs using www unlockunit com and the service was always excellent.
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Thank you. I checked it out and it doesn't seem to support "Galaxy S5 SM G900A"; the only thing close to that is "Galaxy S5 SM G900F". Appreciate it if you can suggest another site.
miko85 said:
Just use att they will unlock your sim
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I'm unable to do so because the smartphone is still under contract.

Call ATT. New laws made all carriers be (generally) required to unlock their SIMS not bootloaders under some conditions. see link https://www.fcc.gov/consumers/guides/cell-phone-unlocking-faqs
If u are under contract they will make u pay but u then meanwhile u can use another carrier. Here is a link to an unlock service. https://www.doctorsim.com/us-en/unlock-phone/samsung/
Good Luck!

kwmike said:
Call ATT. New laws made all carriers be (generally) required to unlock their SIMS not bootloaders under some conditions. see link...
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Thanks for the link; I looked over the fine print and unfortunately, I don't fall under those conditions as I am under contract and unable to pay in order to get out of it. :/
kwmike said:
Here is a link to an unlock service. https://www.doctorsim.com/us-en/unlock-phone/samsung/
Good Luck!
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Thanks, I will look into it. What's the difference between unlocking bootloaders and sim unlocking? Any disadvantages on just having the sim unlocked and not the bootloader?

gringolimon said:
Thanks for the link; I looked over the fine print and unfortunately, I don't fall under those conditions as I am under contract and unable to pay in order to get out of it. :/
Thanks, I will look into it. What's the difference between unlocking bootloaders and sim unlocking? Any disadvantages on just having the sim unlocked and not the bootloader?
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They serve entirely different purposes. Sim chooses carrier (ATT,etc). Bootloader chooses what will be started when phone is booted ie system(rom), recovery(TWRP etc), bootloader itself. Bootloader unlock means changes can be made to what will start under different boot requests. No disadvantages to just unlocking sim, often used for foreign travel where your regular sim will not connect. Many times carrier will unlock SIM LATE in contract for foreign travel reasons.

You can try using www.unlockradar.com if you want to unlock your S5. I have a cell phone repair store and I've been using them for a few months and never had any problem. Their customer support is very responsive. https://www.unlockradar.com/unlock-samsung/galaxy-s5-sm-g900a

gringolimon said:
Thanks for the link; I looked over the fine print and unfortunately, I don't fall under those conditions as I am under contract and unable to pay in order to get out of it. :/
Thanks, I will look into it. What's the difference between unlocking bootloaders and sim unlocking? Any disadvantages on just having the sim unlocked and not the bootloader?
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Are you under contract via a next plan thru at&t? If you are planning to unlock to switch carriers I imagine you want to end service with at&t. If so they will want you to pay for the phone in full or return the phone. If you don't pay & keep the phone I'm pretty sure they blackball the imei so it can't be used by any carrier. So what's your end goal here?

joshua14 said:
Are you under contract via a next plan thru at&t? If you are planning to unlock to switch carriers I imagine you want to end service with at&t. If so they will want you to pay for the phone in full or return the phone. If you don't pay & keep the phone I'm pretty sure they blackball the imei so it can't be used by any carrier. So what's your end goal here?
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Yes, I'm under a contract that has been suspended and told them that I am currently not able to pay but also am not able to get another phone due to financial reasons. They said they understood my situation but cannot unlock my phone due to the contract and that once I am able to pay, they will provide me the unlock code if I still want it or wish to continue using their services. I guess what my end goal is to not have to pay for another phone when I'll only use it for medical reasons and once I am financially stable, I can go ahead and pay and probably continue with AT&T. I see your point and understand the predicament I have. I'll just have to wait and see. . .

vlase_2 said:
You can try using www unlockradar com if you want to unlock your S5. I have a cell phone repair store and I've been using them for a few months and never had any problem. Their customer support is very responsive. www unlockradar com/unlock-samsung/galaxy-s5-sm-g900a[/url]
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Thanks, I'll check it out.

gringolimon said:
Yes, I'm under a contract that has been suspended and told them that I am currently not able to pay but also am not able to get another phone due to financial reasons. They said they understood my situation but cannot unlock my phone due to the contract and that once I am able to pay, they will provide me the unlock code if I still want it or wish to continue using their services. I guess what my end goal is to not have to pay for another phone when I'll only use it for medical reasons and once I am financially stable, I can go ahead and pay and probably continue with AT&T. I see your point and understand the predicament I have. I'll just have to wait and see. . .
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No problem. I just am trying to see if you'll end up paying to get it unlocked then have at&t block the phone from being used. Good luck.
~TMS5-3.0-TMBUILD on G900A with Blue Ice Theme

I used www.unlockradar.com

How to unlock SIM?

I'm in peculiar situation: I bought my T-mo S8 direct from Samsung, paid in full, so now whom do I go to unlock my SIM? People from Canada received unlock code together with copy of bill, but I can't find anything on mine, any suggestions? Of course I want to do it as painless as possible and I want to ask here before calling customer service and waste few hours.

pete4k said:
I'm in peculiar situation: I bought my T-mo S8 direct from Samsung, paid in full, so now whom do I go to unlock my SIM? People from Canada received unlock code together with copy of bill, but I can't find anything on mine, any suggestions? Of course I want to do it as painless as possible and I want to ask here before calling customer service and waste few hours.
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I'm in the same boat as you
Sent from my SM-G950U using Tapatalk

pete4k said:
I'm in peculiar situation: I bought my T-mo S8 direct from Samsung, paid in full, so now whom do I go to unlock my SIM? People from Canada received unlock code together with copy of bill, but I can't find anything on mine, any suggestions? Of course I want to do it as painless as possible and I want to ask here before calling customer service and waste few hours.
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I am in the same situation. From my understanding of past and present TMo devices, the account has to be in good standing (EIP/equipment paid off) AND your device needs to have 40 or 45 days (someone correct me) of continuous usage on TMo network before you can request the Device App unlock = carrier unlock.

So just wait until then
Sent from my SM-G950U using Tapatalk

As I suspected, I called Samsung to unlock my phone, they told me to call T-mo, called T-mo, they told me to call Samsung, wasted already 1 hour on this.

escabar said:
I am in the same situation. From my understanding of past and present TMo devices, the account has to be in good standing (EIP/equipment paid off) AND your device needs to have 40 or 45 days (someone correct me) of continuous usage on TMo network before you can request the Device App unlock = carrier unlock.
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It's 40 days, that is I was told by CS. After that you use "Device unlock" app on your phone and choose permanent unlock.
Same techniques for S6 and S7 and it worked for me.

First of all I'm leaving on a trip in 20 days, second, the phone is paid in full now, not in 40, third I didn't buy it from T-mo so most likely they wont have any record of it. It's total BS and should be illegal, in Canada Samsung sends unlock code with the phone., but I guess here consumers have no protection. Last time I'm buying carrier phone. This whole locking of the phones is leftover from carrier subsidies and should not exist outside of those plans, if they still taking place. And a funny thing is I have no intention of leaving T-mo anyway and there are services to unlock phone for money. I remember some law about phone getting unlocked when paid I read about few years ago, but can't get any details now.

pete4k said:
First of all I'm leaving on a trip in 20 days, second, the phone is paid in full now, not in 40, third I didn't buy it from T-mo so most likely they wont have any record of it. It's total BS and should be illegal, in Canada Samsung sends unlock code with the phone., but I guess here consumers have no protection. Last time I'm buying carrier phone. This whole locking of the phones is leftover from carrier subsidies and should not exist outside of those plans, if they still taking place. And a funny thing is I have no intention of leaving T-mo anyway and there are services to unlock phone for money. I remember some law about phone getting unlocked when paid I read about few years ago, but can't get any details now.
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That is T-Mobile branded phone, and that is their rules, sorry for that. What you can do, before going on the trip, on that app/ choose Temporary unlock, it's good for 30 days and you can have it up to 5 times in a year.

pete4k said:
First of all I'm leaving on a trip in 20 days, second, the phone is paid in full now, not in 40, third I didn't buy it from T-mo so most likely they wont have any record of it. It's total BS and should be illegal, in Canada Samsung sends unlock code with the phone., but I guess here consumers have no protection. Last time I'm buying carrier phone. This whole locking of the phones is leftover from carrier subsidies and should not exist outside of those plans, if they still taking place. And a funny thing is I have no intention of leaving T-mo anyway and there are services to unlock phone for money. I remember some law about phone getting unlocked when paid I read about few years ago, but can't get any details now.
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You can call T-Mobile and let them know that you are travelling out of the country on ___ date and ask for an unlock code for a long time customer. It has worked for me in the past if you get the right rep.

mrbear01 said:
You can call T-Mobile and let them know that you are travelling out of the country on ___ date and ask for an unlock code for a long time customer. It has worked for me in the past if you get the right rep.
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I have the same problem, I bought the phone from Samsung.com and there was no option to purchase an unlocked phone. I am traveling in two days for a few weeks and I called Tmobile several times trying to at least get a temporary unlock and even that cannot be done. They said it has to be on their network for 40 days. I even called Samsung and they said all the unlock codes are sent to Tmobile and only they can unlock it due to the stupid Device Unlock app. You cannot unlock it even if you have the code, only the app can unlock it. If I didn't like the S8 so much I would have switched to the iPhone 7. Absolutely ridiculous!!!

I still don't understand how T-mo will know the phone you purchased direct from Samsung is paid for and should not have SIM locked to begin with.

I have the same problem with my S8. Bough it directly from Samsung. I contacted Samsung and they told me that I need contact tmobile; contact tmobile and they told me that my phone does not show in their system as a tmobile phone because I did not buy it from them. I need my phone unlock so when I travel overseas I can use a local sime card. I don't want to wait until 40-45 days go able to unlock my phone and then not be able to return it to Samsung. There some unlock services charging $50.00 plus to unlock it. I don't want to expend more money, since this phone is already very expensive.

kindongo said:
I have the same problem with my S8. Bough it directly from Samsung. I contacted Samsung and they told me that I need contact tmobile; contact tmobile and they told me that my phone does not show in their system as a tmobile phone because I did not buy it from them. I need my phone unlock so when I travel overseas I can use a local sime card. I don't want to wait until 40-45 days go able to unlock my phone and then not be able to return it to Samsung. There some unlock services charging $50.00 plus to unlock it. I don't want to expend more money, since this phone is already very expensive.
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It's not even about money, this should be illegal. This whole business of locking the SIM card is left over from contract subsidized phones and I could perfectly understand that phone belonged to phone company and you just leased it until end of contract. Now I praise T-mo for getting rid of this practice and changing whole industry, so now at least you know what are you paying for and how much. But now SIM locking shouldn't even happen anymore: if phone is stolen/unpaid for, blacklist IMEI and also you can unlock SIM for the fee, even if it is stolen, so what purpose this SIM locking serves? Canada gets unlock code with the phone.

Anybody had any luck getting the phone unlock.?I waited too long to return the phone, now I'm stuck with it.

http://www.cellunlocker.net/t-mobile-device-unlock-app.php
the service is expensive $130 dls for the unlock

kindongo said:
Anybody had any luck getting the phone unlock.?I waited too long to return the phone, now I'm stuck with it.
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I was in the same boat as you. Went through T-Force on Twitter and seemed to have gotten a rep on the first go who understood the situation and submitted my IMEI number to the right place. Your IMEI number needs to be added to their "device distribution inventory system" and needs to be submitted to their highest level tech support, this allows the Device Unlock app think your phone came from T-mobile's inventory and will let the app unlock your phone.
There may be hope for everyone in the future, this one of the final responses I got from them:
"I am right there with you. It definitely makes things harder on both sides since the phone isn't technically bought from us, even though it is branded a T-Mobile phone and our system rejects any IMEI that didn't come from our inventory. None the less, we're all about giving you full access to what is yours. Teams are currently working on a process update that'll make things a lot more seamless, but in the meantime we've got this work around! I really appreciate you taking the time to reach out to us today!"
14 hours later I tried the Unlock Device app and requested the permanent unlock and was greeted with "Unlock Approved: Mobile Device is permanently unlocked"
Device is fully unlocked, tested with an AT&T SIM card and everything worked fine. After 2 reboots the Device Unlock app even disappeared from my phone. I'm so happy with how fast T-Mobile dealt with this. The more people that make a stink about this issue on social media hopefully T-Mobile will find a permanent fix for people buying a SIM locked at full price and have it easily unlocked under their standard procedure.

INGHUGO said:
http://www.cellunlocker.net/t-mobile-device-unlock-app.php
the service is expensive $130 dls for the unlock
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Did this work for you and were you able to successfully unlock ?

no,unfortunately it couldn't be unlocked because cellunlock no longer have access to their server ,I had to have a contract and wait the 40 days that are the requirement so I can release it

I dont think anybody has now. nearly all the sites i checked unlocking tmobile does not seems to be available.

fragg3d said:
I was in the same boat as you. Went through T-Force on Twitter and seemed to have gotten a rep on the first go who understood the situation and submitted my IMEI number to the right place. Your IMEI number needs to be added to their "device distribution inventory system" and needs to be submitted to their highest level tech support, this allows the Device Unlock app think your phone came from T-mobile's inventory and will let the app unlock your phone.
There may be hope for everyone in the future, this one of the final responses I got from them:
"I am right there with you. It definitely makes things harder on both sides since the phone isn't technically bought from us, even though it is branded a T-Mobile phone and our system rejects any IMEI that didn't come from our inventory. None the less, we're all about giving you full access to what is yours. Teams are currently working on a process update that'll make things a lot more seamless, but in the meantime we've got this work around! I really appreciate you taking the time to reach out to us today!"
14 hours later I tried the Unlock Device app and requested the permanent unlock and was greeted with "Unlock Approved: Mobile Device is permanently unlocked"
Device is fully unlocked, tested with an AT&T SIM card and everything worked fine. After 2 reboots the Device Unlock app even disappeared from my phone. I'm so happy with how fast T-Mobile dealt with this. The more people that make a stink about this issue on social media hopefully T-Mobile will find a permanent fix for people buying a SIM locked at full price and have it easily unlocked under their standard procedure.
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Thanks, I will try that

Galaxy S8/S8+ Device App unlock is now available....for $125

Hello
I found out about this maybe 3 days ago and posted it under S7 forums since I have GS7 but I think someone might benefit from this information around here.
At swiftunlocks.com, they can unlock your t-mobile S7/S7e or S8/S8+ but that price tag of $125.99 is ridiculously high IMHO so I'll wait the price to come down or I'll just resell my phone.
I am in no way associated with that website, just spreading the word since I have used their services for over many years and there was never a failure, at least in my case.
Hope this helps someone.
Cheers

If you use a 3rd party unlocking service for T-Mobile phones, you run the risk of getting relocked at any time, and you're **** out of luck (and that money). Once T-Mobile decides to run their occasional rescan, you'll be locked up again.
You're better off putting that $126 towards paying off your phone, and just having T-Mobile unlock it. Hell, I got mine from Samsung, and T-Mobile unlocked it within a few weeks. Just had to call and ask.

entropism said:
If you use a 3rd party unlocking service for T-Mobile phones, you run the risk of getting relocked at any time, and you're **** out of luck (and that money). Once T-Mobile decides to run their occasional rescan, you'll be locked up again.
You're better off putting that $126 towards paying off your phone, and just having T-Mobile unlock it. Hell, I got mine from Samsung, and T-Mobile unlocked it within a few weeks. Just had to call and ask.
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The best one when u no bougth form ebay or other source.

entropism said:
If you use a 3rd party unlocking service for T-Mobile phones, you run the risk of getting relocked at any time, and you're **** out of luck (and that money). Once T-Mobile decides to run their occasional rescan, you'll be locked up again.
You're better off putting that $126 towards paying off your phone, and just having T-Mobile unlock it. Hell, I got mine from Samsung, and T-Mobile unlocked it within a few weeks. Just had to call and ask.
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Although I agree with your reasoning, not many people can unlock devices through T-Mobile. I don't have their account and person I bought my device from is out of my reach. Phone is not blacklisted, it is fully paid and is bought on samsung.com. 3rd parties are my only choice, even TMO/T-Force representative directed me to them after refusing to help because I'm not their customer (and will never be).
I believe this is a permanent unlock, and it's better than nothing we used to have, but even if it's permanent, still, this is very, very expensive.
$126 for an unlock is just BS, especially when 99% of phones can be unlocked under $50

You can unlock 2 phones every 12 months at no charge directly from T-Mobile. If the carrier unlock app is not working, you probably bought the phone directly from Samsung like I did. Call T-Mobile, tell them you want to unlock because you're going out of the Country, they'll ask for the IMEI, submit unlock request to Samsung, retry the app in a week, done.

dylyxcore said:
You can unlock 2 phones every 12 months at no charge directly from T-Mobile. If the carrier unlock app is not working, you probably bought the phone directly from Samsung like I did. Call T-Mobile, tell them you want to unlock because you're going out of the Country, they'll ask for the IMEI, submit unlock request to Samsung, retry the app in a week, done.
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did they ask you for a tmobile account? I have tried calling them but once I let them know I don't have a tmobile account they stop helping me. they have asked for it every single time I try (5 now).

Simaldonado89 said:
did they ask you for a tmobile account? I have tried calling them but once I let them know I don't have a tmobile account they stop helping me. they have asked for it every single time I try (5 now).
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i think you need to be one of their customers, because when i talked to T-Force on FB, they ask me verify my phone number. well, I found one listing on ebay for $160. But might as well sell your phone. And get different carrier like ATT, the unlock process is much easier/cheaper.

baophucdinh31 said:
i think you need to be one of their customers, because when i talked to T-Force on FB, they ask me verify my phone number. well, I found one listing on ebay for $160. But might as well sell your phone. And get different carrier like ATT, the unlock process is much easier/cheaper.
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This is correct, the T-Force rep on twitter sent me a link to log into and verify my active account status on my.t-mobile.com.

Well...the Metro PCS unlock app services are falling in price so hopefully the T-mobile services will follow suit? Oh and I totally tried converting my T-mobile S8 to a Metroc PCS one but the Metro device unlock app could not connect to the server so sadly the T-mobile device unlock app on a T-mobile firmware is still the only option =(

beserker15 said:
Well...the Metro PCS unlock app services are falling in price so hopefully the T-mobile services will follow suit? Oh and I totally tried converting my T-mobile S8 to a Metroc PCS one but the Metro device unlock app could not connect to the server so sadly the T-mobile device unlock app on a T-mobile firmware is still the only option =(
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I dont get it. Metro PCS and Tmobile is pretty much a same company. Yet, there is a huge price gap between them @@

T-Mobile Pixel 4 XL is carrier locked, looking for unlock

Is there anybody who can unlock my Pixel 4 XL just like it was done with the OnePlus 7 Pro? I really appreciate if it's possible

Call them and ask for unlock, did mine last night with no issues

capsnbottles said:
Call them and ask for unlock, did mine last night with no issues
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You paid in full? They don't wanna do it for me, I need a employee here on XDA who is willing to do it for me

SmileBigNow said:
You paid in full? They don't wanna do it for me, I need a employee here on XDA who is willing to do it for me
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Nope, im on the jump on demand program. I told them I was leaving for work overseas and needed it asap like they have always done for me. Sweet talk them a little if you have to. Threaten to return it or something. Keep trying and eventually you will get someone cool, avoid the over seas reps at all costs though, they are useless

capsnbottles said:
Nope, im on the jump on demand program. I told them I was leaving for work overseas and needed it asap like they have always done for me. Sweet talk them a little if you have to. Threaten to return it or something. Keep trying and eventually you will get someone cool, avoid the over seas reps at all costs though, they are useless
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Gotcha, maybe I'll try T-Force, will see how that will go

There a a thread I read today that showed 2 people unlocking a Verizon pixel by taking the sim card out and setting the phone up while connected to WIFI. They where able to check the unlock button then unlock with adb.

srimay said:
There a a thread I read today that showed 2 people unlocking a Verizon pixel by taking the sim card out and setting the phone up while connected to WIFI. They where able to check the unlock button then unlock with adb.
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Click to collapse
Just taking out the SIM card will make the option in settings available?

Apparently...

srimay said:
Apparently...
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Interesting

capsnbottles said:
Nope, im on the jump on demand program. I told them I was leaving for work overseas and needed it asap like they have always done for me. Sweet talk them a little if you have to. Threaten to return it or something. Keep trying and eventually you will get someone cool, avoid the over seas reps at all costs though, they are useless
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Click to collapse
I just did the same thing and they said no problem your JOD, whitelisted my number / device and going to the app doesn't work!! Tried a ton of times. He's calling me back shortly to verify working or not. Hopefully they get this right bc otherwise I'm returning and buying Google. Gotta have root.

You're looking for a carrier unlock to unlock to bootloader or to just have the phone Sim unlocked?
Either way you're at the mercy of your carrier. Until the phone is paid in full they legally don't have to Sim unlock it, and if it's never fully paid it will be blacklisted on all major carriers
Sent from my Pixel 4 XL using Tapatalk

Well TMO has no idea why it won't work. Device is listed as applicable for unlock and they claim it's good to go. Going to website on my account shows device as locked and eligible for unlock but will not unlock via TMO app. Technical support escalating to engineering as expedited. Guess we will see what happens from here. I've w feeling I'm returning this to TMO in favor of Google p4xl and I'll wait for op7t pro McLaren 5g to arrive on tmo for my jod

Ippolito1971 said:
Well TMO has no idea why it won't work. Device is listed as applicable for unlock and they claim it's good to go. Going to website on my account shows device as locked and eligible for unlock but will not unlock via TMO app. Technical support escalating to engineering as expedited. Guess we will see what happens from here. I've w feeling I'm returning this to TMO in favor of Google p4xl and I'll wait for op7t pro McLaren 5g to arrive on tmo for my jod
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The app on the Pixel is broken, they have to do it manually on their side

SmileBigNow said:
The app on the Pixel is broken, they have to do it manually on their side
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Click to collapse
I've talked to 2 people now. Neither has been able to do it. They did yours?

I'm in this same boat of the unlock app not working. Device is eligible, IMEI whitelisted multiple times, still fails every time. I now have a support case with the executive response team and have been going back and forth trying to find a solution. They've had me swap the phone with a new one and issued me a new temporary plan on a different SIM, neither of which made a difference. There is clearly a problem with their unlock app not working with this phone. No one at T-Mobile seems to know what's going on.

So my device was unlocked remotely without the T-Mobile unlock app.
This only happened once I filed a complaint with the FCC. Other people have stated that they had their device unlocked within a couple days after filing a complaint with the FCC.
I received an email this morning from the FCC that they contacted T-Mobile to unlock my device under federal law requiring carriers unlock eligible devices.
A few hours later I got a notification stating my device has been unlocked (no T-Mobile unlock app required).
It's a shame you have to involve the government so companies follow the law. I was previously told the device unlock app was the only way to unlock my phone, obviously not.
I'd recommend anyone who is struggling with the unlock app file a complaint with the FCC. If you are eligible to unlock the device under T-Mobile's policy, they are required by federal law to do so.

Question att denied unlock request

I just purchased a Samsung S21 Ultra AT&T version from samsung.com and paid the full payment. I requested to unlock my phone in att's website but my requested was denied because my service hasn't been active for at least 60 days.I do not have any payment installment and contract with AT&T since I paid the full price when I bought my phone. I tried to call ATT customer service 800-331-0500, but each time I said unlock phone to the phone robot, the call was disconnected and directed my to submit a unlock request online. I am current using Cricket Wireless, and the the sim card works on this ATT locked phone. I want to unlock it because I would like to flash the XAA firmware. Does anyone have experience to handle the unlock process with ATT? Thanks in advance.
Update on 3/16/2021:
I called ATT retention department and talked with 3 reps, but no one was able to solved the issue. Two rep said they were not able to unlocked a phone without 60 days ATT service or let me ask samsung to unlock the phone, and the third one directed me to fill the unlocking form in the https://www.att.com/deviceunlock/ again. This request was denied within one hour, claiming "Your IMEI number & device don't match". This reason is different with my first request. I am very confused with their unlocking system. After 24 hours (this afternoon), I submitted an online unlocking request again. Surprisingly, this request was approved within half an hour. This is a happy ending, but I hate this hassle progress.
Hope my experience can help someone else.

Call them again and ask to talk with the Customer Loyalty Dept aka Retainment Dept.
Escalate the case if needed.
If nice doesn't get it, hound them.
If bought with a Master Card you can file a claim for a refund (you need return the phone first).
Trust me if you're assertive with AT&T you'll get it done. Been there, done that... many times

blackhawk said:
Call them again and ask to talk with the Customer Loyalty Dept aka Retainment Dept.
Escalate the case if needed.
If nice doesn't get it, hound them.
If bought with a Master Card you can file a claim for a refund (you need return the phone first).
Trust me if you're assertive with AT&T you'll get it done. Been there, done that... many times
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Thanks for your suggestion. ATT sucks.

qoupan said:
Thanks for your suggestion. ATT sucks.
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You can play with them. The CEO gives their reps a lot of leeway to resolve problems.
You just need to leverage them a bit sometimes.
Consider it assertiveness training.
One way or another... get it done

Just a question, why get a carrier locked phone instead of an unlocked phone to begin with?

Sonin66 said:
Just a question, why get a carrier locked phone instead of an unlocked phone to begin with?
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The reason I bought a ATT locked phone it the 256gb black unlocked version is out of stock.

qoupan said:
The reason I bought a ATT locked phone it the 256gb black unlocked version is out of stock.
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At the worst you'll only need to wait 60 days to comply with the contract.
Speed is always expensive...

Sonin66 said:
Just a question, why get a carrier locked phone instead of an unlocked phone to begin with?
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It is not unusual for a Carrier to have this kind of policy - TMobile has a similar rule - I don't know about Verizon, but I wouldn't be surprised if they did too. Like someone said earlier, if the OP complains long enough, there is a very good chance he will get what he wants.

Geekser said:
It is not unusual for a Carrier to have this kind of policy - TMobile has a similar rule - I don't know about Verizon, but I wouldn't be surprised if they did too. Like someone said earlier, if the OP complains long enough, there is a very good chance he will get what he wants.
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I had AT&T unlock my S4+ as I was in compliance with the contract.
They are contractually bound by that agreement.
They are only obligated to fullfill the terms of that contract although they may choose to alter it on the OP's behalf.
One point to remember though is that they make most of their profit by providing cell service not the devices.
The OP should carefully check the buy out clause(s) in the contract as well as any state laws that apply ie contact the State Attorney General's office.

I found this thread when I did the research. It analyzed the potential reason why ATT's unlock system is problematic.
S21 AT&T variant purchased from Samsung.com IMEI not recognized in unlock portal | AT&T Community Forums
@ATTCARES Samsung CS confirms phone is an AT&T device per their IMEI portal. AT&T's unlock portal does not contain the IMEI so they have no ability to produce an unlock code. Device is acti...
forums.att.com

you do know that carrier unlock is not needed to flash the xaa firmware