Apple's iPhone is authorized for use only on AT&T's 3G wireless network, although new code made available on the Web this week is looking to change that. And Apple is responding.

There is a movement afoot to "free" iPhones from their dependence on AT&T's network so the smart phones can be used by customers of other carriers, by running code that "unlocks" the device. This code, called Blacksn0w and made available for free by iPhone hacker George Hotz (known as Geohot), works at the iPhone's operating system level to "jailbreak" the phone from AT&T and reconnect to the user's GSM network of choice. iPhones that have been broken out are also able to load software from various sources, not just the Apps Store.