Phone keeps ringing no one there

Try resolving your experience by resetting your network settings . From your Home screen, simply navigate to Settings > General > Reset and reset network settings. Also, go to Settings > Cellular > Cellular Data Options and disable LTE if enabled.

If you see the signal change it means that the phone is switching either between networks or the network can’t keep an HSPA+ connection stable (so it switches back to 3G).

To enable 5G, go to Settings > Connections > Mobile networks > Network mode and select 5G/4G/3G/2G (auto connect) .

When 5G speeds don’t provide a noticeably better experience , your iPhone automatically switches to LTE, saving battery life. 5G On: Always uses 5G network when it’s available. This might reduce battery life.