As of Friday, August 1st, it is now legal for US consumers to unlock their cellphones and take them to other carriers. Both the US Senate and the House of Representatives (in an ultra-rare bipartisan decision) signed off on the bill, and Friday was the day that President Obama signed it into law. The White House commented on the bill signing, calling it a "triple win" - one for the American consumer, one for wireless competition, and the other for bipartisan congressional action. (Did you see any flying pigs this weekend?) Here's a quote with a few more details, Of course, you need to remember that not all carriers use the same radio technology, so you can't just take a Sprint phone and use it on AT&T. You will need to be cognizant of whether your device's radio is GSM or CDMA (or both) and plan accordingly.