Resetting all settings
A common troubleshooting step is resetting all of your apps to their factory defaults if you are having trouble with your device; your personal information will not be deleted.
1.
From the Settings app, scroll to and tap System.
2.
Tap Reset options.
3.
Tap Reset app preferences.
Resetting your app preferences will reset all customized settings on your phone. Personal information will not be deleted.
4.
Tap Reset apps.
5.
You've completed the steps!
