US congress has passed a bill that makes it legal to unlock mobile phones so the devices can, at least in some instances, be used on other carriers.
The law, which President Barack Obama said he looks forward to signing, undoes a move by the Librarian of Congress in 2012 that made it a copyright violation to unlock a phone without the carrier's permission.
The law passed on Friday by the House of Representatives makes it legal to unlock phones for personal use, at least until the Librarian's next round of rule-making next year.
The measure was passed earlier by the Senate.
Unlocking typically involves entering codes on the phone.
In more difficult cases, the phone needs to be hooked up to a computer to have new software installed.
Carriers have, in some instances, sued people who made a business out of unlocking phones and reselling them, but individuals unlocking for personal use have never been pursued.
Major carriers have become more lenient in their unlocking policies in recent years. Verizon, for instance, ships most of its phones unlocked.
However, technical differences mean that it's often difficult to move a phone from one network to another, and if you can make the move, phone functions are impaired.
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