NumBuster lets you remove phone numbers from your block list to start receiving their calls and messages again.

Managing your block list

1. Open the Block List. You can do this via Settings (go to Settings → Block Settings) or from the Home screen.
2. Tap the Unblock icon (the arrow).

3. Swipe the phone number to the left.

Unblocking via the phone number profile

1. Open the profile of the blocked phone number.
2. In the bottom right corner, tap the Unblock icon to remove the phone number from your block list.