U.S. Sony Xperia XZ3 & VoLTE on AT&T??
I was just wondering...........will Sony phones like the upcoming Xperia XZ3 (U.S. version, release date: 10/17/2018) be able to access ALL of AT&T's network radio bands without VoLTE certification? I know T-Mobile doesn't allow access to their 700 MHz spectrum (aka Band 12) without VoLTE certification, but does AT&T require the same thing? Or will users get FULL access, just no VoLTE?? Also, does AT&T actually require VoLTE certification??