"From Saturday, Americans will have to get permission to “unlock” their smartphone so it runs on more than one mobile network.
On that date a 90-day time limit that made it legal to unlock phones without permission is due to expire. Many Americans unlocked their phones to avoid running up big bills when travelling outside the US.
An online petition has been started asking for unlocking without permission to be made permanently legal. So far, about 3,500 people have signed a petition on the White House website asking for unlocking to be legal all the time - 100,000 signatures are needed before the US government responds."
Source : US phone unlocking deadline expires - BBC News
I think all Americans should sign this petition, I find it so annoying that networks can lock your phone, that way they restrict so many features of your phone, which would normally be free of charge to use, but they make it part of different deals and that way you have to pay more!