From this list, it’s possible for you to see all blocked contacts.
To unblock a contact, swipe right to left on the contact and tapUnblock.
you’ve got the option to also see blocked contacts in the Voicemail section of the Phone app.

To do this, go toPhone>Voicemail>Blocked Messages.
This list contains all of the voicemails left for you by numbers you have blocked.
How to Find Blocked Callers in FaceTime
Blocking callers isn’t limited to the Phone app.

you’re free to block callers inFaceTime, too.
Here’s how to find the list of people you’ve blocked:
TapFaceTime.
This list shows all blocked contacts.

To unblock a contact so they can FaceTime you again, swipe right to left and tapUnblock.
These are all of the contacts you’ve blocked from contacting you.
To unblock them so they can text you, swipe right to left on a number and tapUnblock.

Here are answers to some other important questions about blocking numbers:

