How to blacklist a number on iPhone?

I want to block certain numbers (both SMS and incoming calls) on my iPhone. Is there a way? If it can only be done via application then does anyone know good application for this?

You can only if you have a jailbroken iphone with iBlacklist or Block calls
or you can ask you service provider to block the numbers

  • Will verizon blacklist my iPhone if I cancel? So I was wondering if I cancel and pay the fee that you get charged for canceling before time, if they would blacklist my iPhone such as getting bad esn and not being able to activate later in the year?
  • Why is my iPhone number being displayed wrongly on my number? My number is X, but on "my number" settings, it's being displayed number Y. Why is that? Also, some people told me that when I call or text them, the number Y is appearing to them, not the number X as it should. On the other hand, if I call the number X, my iPhone rings normally, but the same thing doesn't happen when I call number Y.
  • Unblock a iphone 4 imei from carrier blacklist? I have a iphone 4 from tmobile didn't pay the bill now the phone is blocked from further activation i'm thinking about selling it but i need to know will it stay as an ipod forever or can the imei be unblocked and reused on that network? I have factory unlocked it but still no luck it is basically an expensive ipod
  • My number is invalid number in viber, I have an Iphone 5s? When I want to setup my Viber on my Iphone 5s it shows an error that says "invalid number", every number that I put is an invalid number. What should I do?