This depends on your device.
Even after the 3G network is switched off, you will still be able to make calls as long as your phone supports 4G and VoLTE.
How can I easily check if my phone is compatible?
iPhone
• Go to Settings > Cellular > Cellular Data Options > Voice & Data
• If “4G” or “VoLTE” is displayed, your phone is compatible.
• If you only see “3G”, your phone is not compatible with the required technology.
Android (Samsung)
• Go to Settings > Connections > Mobile Networks
• Check whether options such as “4G”, “LTE” or “4G Calling/VoLTE” are available.
• If there is no VoLTE option, your device may not be compatible.
You can also check our list of compatible devices.
