When you block someone from contacting you on the iPhone?

What happens on the other end? Does the person trying to contact you get an instant reply message saying the number has been disconnected or is not in service? Or do they just try to contact you and you don't get the messages or calls so they think you're ignoring them? How does it work when you block a specific number in the settings on the iPhone?

Get a friend or family member to help you. Block their phone, then you use that phone and call your phone. There's your answer.

Remember to unblock once you are done.

They don't get anything, same with text, they have no idea you didn't get it.

Blocking is no nice