Will an unlocked Sony Xperia Z2 run on AT&T in the US?

I'm looking at buying an unlocked Sony Xperia Z2 to replace my current Iphone 4S. I was wondering if doing so would cause any complications, mainly because Sony hasn't released phones for US AT&T users. If I buy this phone internationally unlocked, will I be able to move my Iphone 4S sim card into it? Will the phone run AT&T coverage, particularly 4G LTE?

I don't know what your talking about they sell sony xperias here in the USA just buy an unlocked one and use your att service with it i don't know if the sim cards are the same size but if not just go to any AT&T store HQ and theyll replace it

Specifically, the Xperia Z2 D603 shouldn't give you any problems, but you might need to manually input mms and data APNs.

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