Call O2

Wifi and 4G Calling is available on many of our devices. Check if it’s available on your device. On some Android devices, Wifi and 4G Calling will only work if you’re using O2 firmware . That’s essentially the software that makes your device turn on and run.

Simply switch your phone off and back on and check that it has been enabled again under: Settings > Mobile Data > Mobile Data Options > Voice & Data > VoLTE. Then, head to Settings > Mobile Data > Mobile Data Options > Voice & Data > VoLTE and check that 4G calling is enabled.

Wi-Fi Calling is a service for Android and iOS smartphones providing the ability to make and receive phone calls over a Wi-Fi connection. It’s simple to use with no separate application or log-in required. Wi-Fi calling is a free service when calling to a U.S., U.S. Virgin Islands, or Puerto Rico number .