Is it compatible to AT&amp;T or T-Mobile?
647550
It works with T-mobile definitely. Please check AT&T's frequency to make sure it will work.
2132110
i have T mobile and it DID NOT work on 4G/LTE for me. It's not compatible with the US carriers and only picks up 3G in my experience.
643499
I'm using it on T-Mobile network. Have no idea about compatibility with other networks.
1516526
It's unlocked, so as long as it's a compatible Sim card it should be fine. We have it with AT&T.;
1354320
Bought it for my Mom. It is very compatible to AT&T; mobile. Sorry don't know about the other providers, but it's an unlocked universal phone, so you should be fine. Phone works fine for my senior citizen mother. She loves it.
384947
It is a unlocked phone with some AT&T; apps installed. I am sure it works with T-Mobile because I just tried it :-)
1588246
I think it's only AT&T compatible but I'm not sure. You should ask the seller. Have a blessed day!
2183604
Yes, the Xperia M is compatible with an AT&T; SIM card.Thank you.Customer support @ phonesnbeyond
964777
Not sure what do you mean. I just inserted the SIM card and worked. About AT&T, it is compatible with their bands.
1634935
Yes, this is an UNLOCKED GSM phone it will be compatible with any GSM carrier.
405270
Don't know, but it wasn't compatible with Verizon. Contact your AT&T; store with the model number and they can tell you.
1568200
Yes. But it is fully functional only on AT&T; platform. We returned ours as it was not compatible w/provider.
1207384
I cannot confirm whether or not it is compatible but I can assure you that there is a slight difference between the Int'l One X and the AT&T version. I suggest you do not take the chance and specifically look for the AT&T replacement part
1023861
Yes it is compatible with tmobile, that's what I have for my mom and she is a sr.
844179
Mine works with T mobile there fore I presume it is compatible with all 4G's.
696827
I'm using it on AT&T; but it should work for tmobile as well as this is unlocked.
1358730
I am using it on T-Mobile, but I can't imagine that it wouldn't work with AT&T; as they have the wider choice of bandwidths in the US.