I purchased a iPhone used and cannot remove Apple ID
I purchased used iPhone and cannot remove previous owners Apple ID . I have set screen lock , touch pass code and sign in to App Store using my apple id
iPhone 6s Plus, iOS 15
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Take it back to seller and get them to do the things in this support article or ask for a refund --> What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
Unless you have the account information that set the lock, or the original receipt from Apple, you cannot remove the lock; recycle the device. Read this article about how to remove Activation Lock --> How to remove Activation Lock - Apple Support