You likely have a cellphone that you bought from a carrier, like AT&T, Verizon or Sprint, and that phone only works on that carrier's cellular and data network -- unless you "unlock" it.
That is a software process that allows the phone to work on other carriers if you put in a new SIM card or want to take the phone to another carrier for service.
If that sounds complicated to you and like something you wouldn't bother with, then today's news won't matter to you. But if that's something you've done before or have thought about doing, then you should know that starting today it is illegal to unlock a subsidized phone or tablet that's bought through a U.S. carrier.
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