A great many of these issues (though not all) appear to be caused by a mismatch between the phone and the carrier regarding WiFi Calling support.
Both ends need to have it enabled, or disabled, or shit like constant renegotiation, dropped/missed calls, extreme battery drain, etc. happen as the device tries to do one thing while the carrier network another.
A great many of these issues (though not all) appear to be caused by a mismatch between the phone and the carrier regarding WiFi Calling support.
Both ends need to have it enabled, or disabled, or shit like constant renegotiation, dropped/missed calls, extreme battery drain, etc. happen as the device tries to do one thing while the carrier network another.