SpoofCard

SpoofCard is a service that allows for complete privacy when calling someone. While this is a great use for the service, a greater use is definitely the prank calling you can do with it. SpoofCard allows you to have your caller ID show up as any number you want, and also supplies you with multiple voice changers, and even a call recorder!

This service was originally available for jail broken iPhones, then available on the iTunes store, but is now available on the SpoofCard website for iPhones, Droids, and Blackberries.

Free trials are available for those who don't believe how hilarious SpoofCard can be.

Visit the SpoofCard website here.