How do you block a number on an iPhone 4?

Simply go to your list of recent callers (open the Phone app, then hit the Recents tab at the bottom). Click the 'i' symbol next to the unwanted number, scroll down and tap Block this Caller, then confirm your decision. You won't be bothered with any calls, texts or FaceTime calls from that number.Oct 21, 2016 read more

Do so by tapping the name of the person you wish to block. This number is no longer be able to reach you on your iPhone by phone call, FaceTime, or Messages. Repeat the previous two steps for all numbers or contacts you wish to block. You can unblock numbers from this menu by tapping Edit in the upper-right corner of the screen and selecting them. read more

There are applications that do this if you have jailbroken your iPhone. Without jailbreaking however there isn't a way to block a single or specific incoming number. I've known people that have requested their provider to block a certain number and without a very good (usually legal) reason, they won't do it. read more

The message "You will not receive phone calls, messages, or FaceTime from people on the block list" will appear with two options: Block Contact or Cancel. Hit Block Contact to add the number to the big, bad blocked list. Block from Messages by selecting the message thread with the contact and tapping the blue "i" in the upper right corner. read more