Anyone using this on AT&T?

[mattnathaniel12]

I have the duel Sim version and best I get is H+. I have never seen Lte or 4g displayed on my screen. I'm new to Sony phones so I don't know if the icon for Lte or 4g just doesn't show up or what. I came from a 4g phone on AT&T and the nano Sim is a 4g Sim.

 

[mattnathaniel12]

Good news for anyone other then myself that was having this issue! Out of pure curiosity i took my wifes sim out of her at&t phone and swapped it with mine just to see what would happen, and HOLY SH*T i have LTE! So knowing it must have been my new sim causing the issue I took it and put it into my wifes phone and BAM it showed as LTE on her phone. Then I put both sims back into their origional phones and SUCCESS my phone now shows LTE. No freaking idea what this did exactly and how it worked, but somehow it must have affected the new sim I obtained from AT&T. How the people at the AT&T store and techsupport didnt know this is beyond me. Anyways cheers!