A new change to US copyright laws has made it legal to 'Jailbreak' iPhones or unlock Apple's smart-phone and use an alternative service provider.
In a review of copyright rules, The US Library of Congress has changed a 1998 position that banned phone owners from overriding locks.
Librarian of Congress James Billington said iPhone users who chose to Jailbreak their phone would "not be subject to the statutory prohibition against circumvention."
The argument is that the locks were intended to bind customers to their network rather than prevent breaches of copyright.
"The Copyright Office recognizes that the primary purpose of the locks on cell phones is to bind customers to their existing networks, rather than to protect copyrights" said Jennifer Granick, of the Electronic Frontier Foundation.
"We are thrilled to have helped free jailbreakers, unlockers and vidders from this law's overbroad reach"
Although Jailbreaking your phone won't break any laws, it will invalidate your warranty, ruling out any support from Apple in the event that your phone develops a fault.
Apple recently became world's biggest tech company. This could have a significant impact on the iPhone as a platform for games.