Cyslawohttps://zentalk.asus.com/en/discussion/comment/181379#Comment_181379HD voice works in all carriers (however i see that not in all calls, maybe it depends if interlocutor's phone have hd voice too), but in t mobile there is volte available, so ...
if it supported even HD Voice (AMR-WB) on 3G networks, it would be much much better. However reading comments on this forum or XDA shows it does not (for unknown reason). Come on ASUS, act. This software issue ruins perfect phone!
