1. The Ultimate X-Ray
2. Fake Calls
It imitates you receiving a call. You can pick out who is calling, delay when the ???call??? actually occurs. Have President Obama give you a call requesting your help on a CIA mission.
3. Pranktionary
A $0.99 iPhone app that can randomly suggest pranks for the home, the office, or for that lovely date you??re going on tomorrow.
4. Mister Prank
Mister Prank is a simple iPhone application that mimics the functionality of online soundboards. It has a series of pre-recorded phrases to use in lie of you talking on the phone.
5. iFart
There are more apps than this out there, if you are looking for the soundboard functionality, I recommend BeefyBoard, simply because you can download more sounds into it as you need them and you can switch out the boards to your hearts content.
Just released in the AppStore, iMakeOver lets you transform any webpage into a hilarious spoof. Stage an alien landing on the New York Times homepage and see how many people fall for it!
http://itunes.apple.com/us/app/imakeover/id371907666?mt=8
Good list and i found Prank Me! for iPhone which works pretty fine for making prank calls with a huge list f funny audio clips.
Have a look
http://itunes.apple.com/us/app/prank-me/id376184194?mt=8
This app let’s you “Sucker-Punch” all those phone obsessed folks out there. The really great part is how the front-facing camera catches their reactions! A lot of fun and it’s free – http://bit.ly/SneakyMonkey