And I quote from AppleInsider;
The U.S. government on Monday announced new rules that make it officially legal for iPhone owners to “jailbreak” their device and run unauthorized third-party applications. In addition, it is now acceptable to unlock any cell phone for use on multiple carriers.
According to The Associated Press, the government approved a handful of new exemptions to a federal law that prevents the circumvention of technical measure that prevent users from accessing and modifying copyrighted works. The report noted that every three years, the Library of Congress’ Copyright Office authorizes exemptions to ensure existing law does not prevent non-infringing use of copyrighted material.
In addition, another exemption was approved that would allow all cell phone users to unlock their device for use on an unapproved carrier. Currently, Apple’s iPhone is available exclusively through AT&T, but unlocking it can allow for voice calls and EDGE data speeds on rival carrier T-Mobile.