If you have an iPhone and have deleted numbers, there is a good chance that they are still on your phone. To unblock them, you will need to find the number and tap on it. Once you do, a list of options will appear. You can select one of the following to unblock the number:

  • Block the number from being called: This will prevent it from being called and added to your contact book.
  • Remove the number from your phone: This will remove it from your phone and add it back to the list of numbers that you can call.