Change apple id on phone
How do I change the apple id associated with my phone?
iPhone 7
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Click on this link to learn how to 'Sign in with your Apple ID' --> https://support.apple.com/HT204053
If another Apple ID is signed in you may need to enter the password for that ID to sign out of that ID first.
If you're doing this as part of selling or giving away a device, read this document --> What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support