How do I block a number on my iPhone?
Call your carrier With AT&T it will cost - 5$ A month - but you can block Up to 29 numbers -Per month- but can't block An I message -At all-
Go to the provider where you got the phone
In iOS7 your going to be able to block numbers for free
put *67 in front of the number you are dialing on the keypad. I do it for prank calling all the time...
You have to call your phone carrier association, they'll help you from there.