Apple’s block list is centralized. If you block a number on iMessage, it is also blocked on Phone and FaceTime.
Have you ever found yourself in a situation where you need to unblock a caller who was previously blocked on your phone? Perhaps you've had a change of heart, or maybe the person who was blocked has apologized and you want to give them another chance. Whatever the reason, unblocking a caller is a straightforward process that can be done on most phones. unblock a caller