iPhone App | Spoof App
Allows for users to change what numbers show up on the caller display. This great tool is free for 2 minute calls without the voice changer/recording feature. Get it now within Cydia. Jailbroken iPhone needed. Once SpoofApp 3G is installed, fire it up and go to the setup screen for free minutes or click the buy minutes button at the bottom to get a SpoofCard PIN number to use with SpoofApp. SpoofCard is the underlying provider of the Caller ID spoofing, call recording and voice changer features, so you must have a SpoofCard PIN number to use SpoofApp.
iPhone [via SpoofApp]