iBlacklist is the best firewall for calls and SMS/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. Works on any iPhone model running any firmware version !!! PLEASE RESTART YOUR DEVICE AFTER INSTALL. REBOOT IF YOU ARE ON IOS4.
You know about iWipeCache? well this ‘app-let’ does the same except it clears the folderswitcherBG cache. just tap the icon after replacing or themeing the folder/switcher image and it will respring the device and when the respring is done the folder will be themed. simples