Blocked calls how do I unblock them
How do I unblock telephone numbers that have been blocked
iPhone 6 Plus, iOS 12
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If you blocked the numbers your iPhone, go to Settings > Phone and tap Blocked Contacts to see the list. Delete the number you want unblocked.
If you blocked the number through your carrier, contact them for assistance.
See also:
Block phone numbers, contacts, and emails on your iPhone or iPad - Apple Support