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Restore the factory default settings
If your mobile phone is slow or in any other way doesn't work or respond as well as it should, it may help to restore the factory default settings. This deletes all configurations you've made in your mobile phone.
1. Find "Reset"
Press Settings.
Press General.
Press Reset.
2. Restore settings only
If you select Reset All Settings, all phone settings are restored but contacts, audio files, video clips and appointments aren't affected.
Press Reset All Settings.
Press Reset All Settings to confirm.
3. Restore settings and data
If you select Erase All Content and Settings, settings, contacts, audio files, video clips and appointments are deleted.
Press Erase Now.
Press Erase iPhone.
Press Erase iPhone to confirm.