Update: The Operator has upped iActivator to v1.1, fetch the update below.
Stemming from the combined effort of the iPhone Dev community, “The Operator” has released iActivator — a stand alone Cocoa-based application for the Mac. iActivator is a simple graphical interface providing iPhone activation/deactivation tools, and methods for breaking/restoring the jail. Take your time, carefully read through the bundled README, and good luck!

Download: iActivator 1.1
- source: http://iphone.fiveforty.net/wiki/index.php/IActivator
damn, i could of used this instead of using the other method while activating my cousin’s iphone
This DOES work well, however i am having issues with the WIFI. I’m not sure if its the iactivator method or the phone itself. I can’t find any occurances of ANYONE being unhappy with their wifi, so i am confused. Some sites work and others do not. Plus i can’t do anything on the open wifi in the lobby of my hotel!