As of January 26, it is illegal for U.S. mobile phone users to unlock newly purchased cell phones without express permission from their cell phone carriers. Cell phone unlocking used to be possible as part of an exemption from the Digital Millennium Copyright Act (DCMA), but the exception ended following a ruling by the Library of Congress's Copyright Office in October of 2012. Sina Khanifar, co-founder of OpenSignal, is protesting the new law with a whitehouse.gov petition calling for the decision to be rescinded. In 2004, Khanifar started Cell-Unlock.com, a business centered around unlocking mobile phones.
