Block unwanted callers in FaceTime on iPad

In the FaceTime app , you can block FaceTime calls from unwanted callers.

In your FaceTime call history, tap next to the name, phone number, or email address of the contact you want to block.
Scroll down, tap Block this Caller, then tap Block Contact.

To unblock a contact, tap next to the contact’s name, phone number, or email address in your call log, scroll down, then tap Unblock this Caller.

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iPad User Guide