How can I turn off "Find my iPhone" on a phone that has been replaced with a new iPhone
How can I turn off "Find my iPhone" on a phone that has been replaced with a new iPhone
iPhone XS, iOS 15
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The following procedure will do that. What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
If you no longer have the old phone, see the "If you no longer have your iPhone, iPad, or iPod touch" section of that support article.