To use VoLTE, your device needs operator-customised software and your subscription (incl. SIM card) must support VoLTE for the device model you're using. To inquire if your device, software, subscription and SIM card support VoLTE, contact your mobile network operator.
Android™ 8.0 To enable VoLTE- Make sure your specific Xperia™ device model and network subscription support VoLTE.
- Find and tap Settings > Network & Internet > Mobile network > Preferred network type > LTE or 4G (preferred)/3G/GSM.
- Drag the slider beside Enable VoLTE to the right.
- Make sure your specific Xperia™ device model and network subscription support VoLTE.
- Find and tap Settings > More > Mobile networks > Preferred network type > LTE or 4G (preferred)/3G/GSM.
- Drag the slider beside Enable VoLTE to the right.