Minor iPhone problems that don’t resolve through restarting the device may benefit from removing the SIM card with a paperclip. Sometimes, the process of taking out and re-inserting the SIM card will reset the phone and restore it to its previous functionality. You can remove the SIM card with a paperclip regardless of the iPhone model you are using. This method of resetting the iPhone can be particularly helpful for errors that read “no SIM card installed” or when iTunes can’t complete the restore process. Writer Bio
