A new iPhone application called iSpoof allows you to fake any Caller ID, disguise your voice, and record your calls.
Major Features: - Go straight to someone’s Voicemail. Don’t feel like talking to some people? Just leave em’ a message! Their phone never rings, but still shows a missed call from your spoofed Caller ID! - Record your calls and replay them straight from your phone. iSpoof also integrates with you Address Book - Spoof internationally - Spoof DIRECTLY from the app! No call-back needed! - Support for iPod Touch, just enter your cell phone number in settings, place a call, and you will receive a ‘call-back’ to your phone. Once you answer, your iSpoof call will be connected! - Simple, easy-to-use interface with iPhone look and feel - Best real-time Voice Changer
NOTE*: You do need to purchase minutes from 123Spoof.com for the length of your call.