No doubt it was part of their deal with AT&T. U.S. telcoms (especially AT&T) are big bullies. Apple needed to play ball when they were first getting started.
Now of course, they don't need AT&T, so they're dropping all the restrictions as soon as they're legally able to.
Now of course, they don't need AT&T, so they're dropping all the restrictions as soon as they're legally able to.