Calls and contacts
Apps and media
Cause 2 of 4: There's an error in the operating system on your phone
If there's an error in the operating system on your phone, it may help restarting it.
Solution: Restart your phone.
Restart your phone
Press the key on the side of your phone.
Remove the battery holder from your phone and wait for 10-15 seconds.Insert the battery and turn on your phone again.See how to insert the battery and turn on your phone.