The self-propagating program changes the phone's wallpaper to a picture of 80s singer Rick Astley with the message "ikee is never going to give you up".
The iPhone operating system, OSX, is based on LINUX.
UPDATE: I am getting a ton of emails arguing over whether OSX is LINUX or BSD or SYSTEM 5, but the fact is that they are all flavors of UNIX. Even the Amigados was a UNIX derivative.
Put down the swords; we all begin with Abraham!
My point being that the chorus of windows bashers who scream that the hackers will never bother you if you switch to a MAC need to realize that it is not the computers that are the problem, but the criminals.