answer:There are two processes that can be done to the iPhone: unlocking and jailbreaking. To unlock: this means you change the iPhone so it works on another network, with any sim you want (ie TMobile). To jailbreak: this means you change the iPhone so you can install programs directly on the iPhone. Some program examples are a chat client, ebook reader, snes emulator, wifi stumbler, IRC client, & rss reader. There are tons of programs.