You need Apple ID to use iMessage, FaceTime calls, shopping with iTunes store, App store and making backup with iCloud. If you want best experience with your Apple devices, each of your device need to use same Apple ID.
Sometimes you need to change your iOS device Apple ID information, country or create a new Apple ID.
Changing Apple ID on iPhone
Learn how to change Apple iD on iPhone, iPad and iPod Touch.
- Launch Settings App in iOS.
- Choose “iTunes & App Store”.
- Press the “Apple ID: [email protected]” at the top of the screen.
- Tap on “Sign Out” at the Apple ID management popup.
This will logout your existing Apple ID. Now you can login with Another Apple ID/account or create a new one.
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Note: Changing Apple ID might conflict iOS with some apps. I mean it might logout your account in Game Center like apps.