Open the Phone app
Tap Recents
Find the number you want to unblock
Tap the info (i) button
Tap Unblock this Caller
If you don’t see “Unblock this Caller,” go to Settings
Tap Phone
Tap Blocked Contacts
Swipe left on the blocked contact or number
Tap Unblock
To unblock from Messages: open Settings
Tap Messages
Tap Blocked Contacts
Swipe left on the blocked contact or number
Tap Unblock
To unblock from FaceTime: open Settings
Tap FaceTime
Tap Blocked Contacts
Swipe left on the blocked contact or number
Tap Unblock
Confirm the number is no longer listed under Blocked Contacts