How to Reset Iphone 6

If you’re having issues with iPhone, you can reset the network settings, keyboard dictionary, home screen layout, and location and privacy settings. You can also erase all of your content and settings.
Reset iPhone. Go to Settings > General > Reset, then choose an option:
Reset All Settings:All your preferences and settings are reset.
Erase All Content and Settings:Your information and settings are removed. iPhone
cannot be used until it's set up again.
Reset Network Settings: When you reset network settings, previously used networks and VPN settings that weren't installed by a configuration profile are removed. (To remove VPN settings installed by a configuration profile, go to Settings > General > Profile, select the profile, then tap Remove. This also removes other settings or accounts
provided by the profile.) Wi-Fi is turned off and then back on, disconnecting you from any network you're on. The Wi-Fi and "Ask to Join Networks" settings remain turned on.
Reset Keyboard Dictionary:You add words to the keyboard dictionary by rejecting words
iPhone suggests as you type. Resetting the keyboard dictionary erases all words you've
added.
Reset Home Screen Layout: Returns the built-in apps to their original layout on the Home
screen.
Reset Location & Privacy:Resets the location services and privacy settings to their
defaults.