How to Block Unwanted Calls or Text Messages on Your iPhone
Trying to get rid of an ex or clingy friend? Just want to keep telemarketers from calling you all the time? You can use the iPhone app iBlacklist (for jailbroken iPhones) to create a list of blocked calls for your iPhone. Blacklisted phone numbers will not be able to send you either phone calls or SMS text messages, so you can continue to use your iPhone in peace. Customize your phone's reaction to blacklisted numbers and adjust the filters for your blacklist, as well.