Open the Settings app
Tap Phone
Tap Blocked Contacts
Find the number you want to unblock
Swipe left on the number
Tap Unblock
Open the Settings app
Tap Messages
Tap Blocked Contacts
Find the number you want to unblock
Swipe left on the number
Tap Unblock
Open the Settings app
Tap FaceTime
Tap Blocked Contacts
Find the number you want to unblock
Swipe left on the number
Tap Unblock
Open the Phone app
Tap Recents
Tap the info icon next to the number
Scroll down
Tap Unblock this Caller