my brother
my brother connected my phone number to his Apple ID. I have no way to get to his account and deactivate it because he forgot all of his information. how do i deactivate my phone number from his account
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See if he can recover the ID/password. An iCloud e-mail address is an Apple ID. Use every email address he can think of.
Apple ID - How to find your Apple -
Other ways to find his Apple ID
He can check to see if he is signed in to the App Store, FaceTime, or Messages on your iPhone, iPad, iPod touch, or Mac, or check to see if he is signed in to iTunes for Windows on a PC. He can also go to iCloud.com or appleid.apple.com and see if his Apple ID prefills on the sign-in screen.
If he forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if he can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.