??????????????????????nubia Z7 Max???VoLTE???????4G??????????????????????ζ???????й?????????????VoLTE 4G???????????4G????????????????????????3G????2G???硣
????????????TD-LTE????FDD-LTE????4G??????????????????4G??????????4G???????????????????????3G/2G???磬??????4G????????????????????????????????

????VoLTE??Voice over LTE???????IP??????似?????????????????????4G?????е??????????????????????????????????????????????4G???磬??????4G???????????????????????????????????????
????????????????????4G?????????VoLTE?????????????????????????·???й?????????????????????VoLTE???á?????nubia Z7??н???????????????????ü??????????????