Apple Insider reports that US carriers have agreed to a standard set of rules for unlocking mobile devices.

We believe this agreement will continue to foster the world-leading range of devices and offerings that Americans enjoy today,” CTIA President and CEO Steve Largent said in a statement. “The robust and differentiated technological ecosystem has brought unparalleled and world-leading benefits to American wireless users, in the form of high-end and affordable devices, post- and pre-paid options, and with the world’s most advanced devices being launched first in the United States.

I never had problems because I live in a place where phone-locking is forbidden. Good to see that the big four in the US are finally coming to their senses.