Having the ability to block unwanted callers would alleviate many headaches if you have repeat calls that are unwanted. With Apple’s latest iOS software you can do just that.
According to Tech Republic, “That’s right! You can now block unwanted callers and messages. The only caveat is that the sender must be in your contacts. So, if there’s someone calling or messaging you that you don’t want to hear from, first add them in your contacts.”
Source: Tech Republic. (October 9, 2013). “Lesser known features in ios7”.