Forum Discussion
Problem with OPPO phone in USA
I have a dual-sim OPPO FInd phone, and I have a USA SIM card with T-Mobile. For the last couple of years I've traveled back and forth to the UK, switching between US and UK sim cards with no trouble....
sethandrew999 wrote:
Does that imply that my phone isn’t going to ever work with T-Mobile for voice calls?
Yes. As of last year, VoLTE is now required to make and receive calls on the T-Mobile network. No compatible VoLTE on your device means the device is no longer compatible with T-Mobile USA or any US based cellular provider's network.
Different carriers use different implementations of VoLTE. T-Mobile has always used Google's stock implantation of VoLTE. The option to use data during a call can be for a few different reasons, like when using dual SIM. It will use the SIM not in use for the call for data usage as long as the call is in progress.
