iBlacklistiBlacklist is the best firewall for calls, SMS and MMS 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 4.X, 3.X and 2.x firmwares !!! PLEASE REBOOT YOUR DEVICE AFTER INSTALL.