VoLTE

Internal doc: T-Mobile to require all new devices to support VoLTE from August 4, and will stop supporting any non-VoLTE phones on its network from January 2021

and even sooner than AT&T Daniel Golightly / Android Headlines : T-Mobile Customers May Need A New 4G VoLTE Phone By January 2021 Matt Milano / IT Management : T-Mobile Soon Will Require VoLTE Phones ...