VoLTE is needed, because 4g does not have any native calling functionality. Older 4g phones don’t have VoLTE, and revert back to 3g when trying to do a phone call. Since 3g is getting shut off, this means those phones will no longer be able to do calls at all, only data and SMS will keep working over 4g for them
VoLTE is needed, because 4g does not have any native calling functionality. Older 4g phones don’t have VoLTE, and revert back to 3g when trying to do a phone call. Since 3g is getting shut off, this means those phones will no longer be able to do calls at all, only data and SMS will keep working over 4g for them