The iPhone does not have the ability to block calls. What some people do is create a blank ringtone and assign that to the numbers you want to block. Then you won't hear the call come in. If you really want to block the number, you'll have to ask your cell carrier.
not only carriers do but chk.nokia ovistore they have a lot of things like this,and some carriers have limited access.iphone is suppose to have a better application,its very unfortunate,thats all iam missing on my machine