Restart the device
Whenever a problem arises with an Android device, the simplest step is to restart your device. To do this, you need to hold down the power button until a message appears to restart the phone, then select it and wait while the device turns on.
How to restart android device This will clean up the RAM on the device and allow the operating system to start from a new starting point. Most of the time, this will fix any problems you find on your device.
Activate and deactivate “airplane mode”
If restarting the device did not work, another common solution when your mobile is not registered on the network is to swipe down from the top of the device screen to open “notifications” and select “airplane mode” in the quick action bar in the top .
airplane mode Once selected, there may be a message confirming the selection: press OK and wait a few seconds, then return to the action bar and deactivate “airplane mode“.
What this does is disconnect the mobile from any signal and then reconnect it. When this method fixes the problem, it is usually because the device was unable to successfully jump from one signal to another, leading to the device behaving as if it were turned off.
This problem often occurs when you drive through areas where there is no signal.
For more information click here: how to fix not registered on network
