Phoney is a fun app to run when someone asks to borrow your phone. It looks virtually identical to the real iPhone application, but instead of placing a call, the app gives the user a surprise. For one reason or another, the call just won't go through. Either the app refuses to dial the number or it "dials" a different number or it appears to dial the number the user entered, only to play an audible message.
Phoney runs on the iPhone, but it can even run on an iPod Touch (2nd Gen.), so you can trick friends and strangers into believing your iPod Touch can place a call.
In the unusual event that the user tries to dial 911, the app immediately tells the user that this is a fake phone app and that the user should quit the app and run the real phone application immediately.