My idea for an app would allow the ability to lock out all other phone functions except for the ability to dial out. That way if someone says "hey can I use your phone?" You can run it and it would present a keypad so they can only dial out without having access to the rest of the phone. Just a thought. I thought that entering a correct passcode would unlock it again. I figure too it would suppress notification of incoming messages and disable the ability to switch tasks via home key. Basically it would make the phone only able to dial out.