How do I reset a trusted number?
How do I reset my trusted number
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Follow these steps:
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To see, add, or change your trusted phone numbers:
- On your iPhone, iPad, or iPod touch: Go to Settings > your name > Password & Security. Next to Trusted Phone Number, tap Edit.
- Choose Apple menu > System Settings (or System Preferences), then click your name (or Apple ID). Click Password & Security, then add or remove a trusted phone number.
- Go to the Account Security section of appleid.apple.com.
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copied from: Two-factor authentication for Apple ID - Apple Support