If you've mucked with the Settings app too much or you just want your preferences to go back to factory defaults, resetting them is easy.

  • Open the Settings app.
  • Navigate to General > Reset.
  • Tap Reset All Settings. You may have to reenter your passcode to do so.

How to reset your iPhone's network settings

Something wonky with your Wi-Fi? LTE towers not connecting? If you can't get online or you're having sluggish service, your network preferences may be to blame. Wiping them will get rid of all your saved Wi-Fi access points and their passwords, VPN and APN connections, as well as reset your cellular connection with the towers, allowing you to enjoy a fresh start on your network.
  1. Open the Settings app.
  2. Navigate to General > Reset.
  3. Tap Reset Network Settings. You may have to reenter your passcode to do so.

How to reset your Keyboard Dictionary

If autocorrect is suggesting some truly strange language, it might be time to dump your keyboard dictionary cache.
  1. Open the Settings app.
  2. Navigate to General > Reset.
  3. Tap Reset Keyboard Dictionary. You may have to reenter your passcode to do so.

How to reset your Home Screen layout

Want to go back to Apple's default app layout? Resetting your Home screen will move all default apps to the foremost Home screen and dump all third-party apps on subsequent screens. It won't reset your wallpaper, however, or delete any of your apps.
  1. Open the Settings app.
  2. Navigate to General > Reset.
  3. Tap Reset Home Screen Layout. You may have to reenter your passcode to do so.

How to reset Location and Privacy

If you want to restore your location and privacy settings to their system defaults, removing all access from third-party apps and requiring them to re-prompt you, this is the way to do it.
  1. Open the Settings app.
  2. Navigate to General > Reset.
  3. Tap Reset Location & Privacy. You may have to reenter your passcode to do so.

How to erase and restore your iPhone

If your iPhone 6 is FUBAR or you simply want to restore an already-activated phone from a backup, here's how to wipe your iPhone and bring it back to Apple's initial setup screen. Note: You'll lose all data on the iPhone that hasn't been transferred to iCloud Drive or another cloud-based service.
  1. Open the Settings app.
  2. Navigate to General > Reset.
  3. Tap Erase All Content and Settings. You may have to reenter your passcode to do so. Once you do this, the phone will erase itself, restart, and return to the setup screen.