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It is now legal to unlock a cell phone in the United States. As promised, President Barack Obama signed the Unlocking Consumer Choice and Wireless Competition Act into law on Friday, the White House announced in a blog post. Previously, unlocking your phone — modifying its firmware — could be considered a violation of federal copyright law, although it was rarely enforced. If you want to celebrate by unlocking your device (without fear of a fine) here’s a handy tip sheet for all four big carriers’ policies and procedures.