jailbreak your iphone
super-easy to jailbreak your iphone using ziphone. first you restore your iphone to factory 1.1.4 firmware using iTunes, then run ziphone and it jailbreaks in a few minutes. then you restore your iphone’s data using iTunes, and everything is back to normal except now you’ve got Installer.app on your phone to install tons of new apps.
ziphone will also unlock your iphone to run on other carriers, but i’m on AT&T so i didn’t need to do that.
here’s a video of the whole process: