ATT Sim in the UK.......and marshmallow - Galaxy S6 Active

Hi All ive got the s6 active from att here in the uk, ive also got hold of an ATT sim which needs activating.
Can anyone tell me if when i activate the sim from the uk i'll be able to upgrade to Marshmallow from 5.02 (baseband g890aucu2aof4) over wifi?
cheers for any answers!

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AT&T S5 on tmobile compatibility

Just a quick question,
I received a galaxy s5 for work today and it is the att version, if I unlock it and use it on tmobile, does it support the same bands as the regular tmobile branded one?? Like LTE and hspa+ 21.
Thanks for all your help ahead of time and tend apologize if this has been posted before, I tried looking for something similar but was not able to find anything.
I have a AT&T Galaxy S5 unlocked. I put my friend's T-Mobile sim card in it and everything worked even LTE without changing anything (APN), it changed automatically. My brother has Claro (by the way I'm in Puerto Rico), with that one I had to change apn's manually to get data working.
I'm freed my AT&T S5 for use on T-Mobile last month and it works just fine. Didn't have to modify any APN settings either as the phone was able to pull it off the T-Mobile SIM.
In all freq's? AWS as well?
SAMSUNG-SM-G900A, with 128gb SD & Rooted.
That's what I'm wondering. I know LTE will work fine. But what about AWS and hspa.

UK Network not recognised with phone

Hi, I recently purchased a Samsung S5 Mini.
model # SM-G800F
Android version 4.4.2
I'd previously read that my sim would work fine according to this: http://www.ebay.co.uk/gds/Choosing-...-on-Three-3-Network-/10000000020620251/g.html
I've inserted the sim but it says 'network locked sim card inserted'
I've got a full signal with the phone and so the issue is definitely related to the sim.
I presume I have to unlock the phone?
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Possible to flash AT&T to a T-Mobile or Metro PCS rom?

Hey all, I was wondering if I could use the Metro PCS or T-Mobile roms on my recently updated (and unlocked) AT&T Galaxy S5 on the 6.0.1 update with baseband G900AUCU4DPH2?
If so, what steps (link) should I take to do this? Also, would it be possible if I had to use the T-Mobile rom, can I make wifi calling and video calling? I'm using a Metro PCS sim, and I had a T-Mobile GS4 before and everything worked fine on it, I just can't make Wifi calls with AT&T because they crippled their phone.
Thanks!

AT&T Samsung S6 Active, unlocked, cannot get to function on Bell Mobility (Canadian)

AT&T Samsung S6 Active, unlocked, cannot get to function on Bell Mobility (Canadian)
Hi,
A friend purchased an unlocked AT&T Samsung S6 Active off of ebay. The phone is definitely unlocked. I can insert a SIM from Bell Mobility without a SIM card message or error. Problem is I cannot get the phone working on Bell's network with a Bell SIM card. tried a Telus SIM card and same problem. Searched all over and found various helpers about entering service mode, change bands, configuring to Bell Mobility APN's etc. but no success.
One site I did find mentioned that the AT&T Samsung S6 Active was special built for AT&T and it will never work on any other carrier due to frequency or antenna limitations of the phone. Has anyone had experience with AT&T S6 Active in Canada? I don't mind doing more reading and research, just at a lost where to turn next...
Thanks in advance,
Murray

US Cellular phone, Cricket/ATT SIM Issues and Questions

Hi, I'm new here but have been using the site for a long time to root several phones of mine over the years. I have a question. I just bought the Galaxy s6 for US Cellular but I have a Cricket SIM and the phone is factory unlocked so when I got it, I had to set up APN to use and now shows as ATT. Cricket ,ATT same company now, I know. The question is, is there a way I can either put this phone on ATT or Cricket stock rom? I have issues with signal bars and I really want Wifi Calling as a bonus. Tried flashing ATT ROM with Odin and 5 files but no luck. PIT failes to re-partition. Any help? Thank you.

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