I also had this issue. Check that the phone cable is connected to the right port on your phone or device. Unplug the gadget or phone from the wall jack. Connect your phone or gadget to another electrical jack that you know is operational. If the dial...

Hello. You also can follow this way. Restarting your phone shuts down and refreshes all background services, which could have crashed and led to your issue. Press and hold the Power button to display the power menu, then tap Restart if you're able.  ...