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Re:Unlocking Cellphones Becomes Illegal Saturday in the U.S. by _delirium on Thursday January 24, 2013 @02:29PM (#5111598)
There's a long whitepaper on the subject here, but U.S. laws by default don't have extraterritorial application: http://www.fas.org/sgp/crs/misc/94-166.pdf

Some laws are explicitly applied extraterritorially; for example, the U.S. has in recent years been prosecuting Americans who travel to other countries to pay for sex with minors, even if legal in the destination country. Drinking when under 21 isn't in that category, though. I have no idea if jailbreaking a phone is. Although, even without extraterritorial application, there might be some kind of U.S. contract violation if the person returns to the U.S. and continues to use the phone.

Re:Unlocking Cellphones Becomes Illegal Saturday in the U.S. by saurik on Thursday January 24, 2013 @02:40PM (#5111674)
Interesting! Given that the US has even been attempting to extradite people who aren't even US citizens on DMCA matters (although not with entire success) I am not certain if the powers that be entirely agree on where their rights are (nor arguably will anyone know until they conclusively win or lose such a case).
Re:Unlocking Cellphones Becomes Illegal Saturday in the U.S. by _delirium on Thursday January 24, 2013 @03:20PM (#5111935)
Internet-related stuff uses a different theory I think, that someone making stuff available over the internet to Americans is basically acting in the U.S. for the purposes of jurisdiction. Same way people who've never been to the UK get sued under UK libel law, because someone in the UK read their article on the internet. The internet makes a big mess of jurisdiction...
Re:Unlocking Cellphones Becomes Illegal Saturday in the U.S. by jlgreco on Thursday January 24, 2013 @04:28PM (#5112347)
Perhaps minorly important: I don't believe the '21 to drink' thing is federal, but rather something the federal government pressures all states into adopting themselves.