How to break the activation lock on iPhone XR
I bought a phone from someone but it has a activation lock
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Activation Lock for iPhone, iPad and iPod touch – Apple Support
There is no way to remove an Activation Lock if you have bought the phone which is locked without getting in touch with the owner. You might want to look at the article above for further help. This is a security measure designed to prevent stolen phones, you have most likely bought a stolen phone which has been locked by the previous owner.