Recent content by celltech5333

For HD Voice between 2 Ue's in AT&Ts network both will have to be VoLTE. AT&T does not support HD Voice for its UMTS network. And if you start a HD Voice call between 2 Ue's on VoLTE, and 1 mobile does a SRVCC handover to UMTS, you will drop to a low AMR rate with a noticeable quality...