iBlacklist is the best call blocker and SMS/MMS selector available for the iPhone. It ables you to select from who you want to receive calls and hide messages. It also removes the sms popup preview protecting your privacy, has parental control mode by blocking outgoing calls, can be fully scheduled and many other features. Try it , you'll love it. Runs on 3.X and 2.x !!! PLEASE RESTART YOUR DEVICE AFTER INSTALL. IT WON'T RESET YOUR CURRENT DATABASE!!!