How about instead of writing new legislation against cell phone unlocking we enforce the anti trust laws we already have?
I wouldn't care so much if there were plenty of other affordable ways to get a phone and coverage, but sim locking is so prevalent in the US that it's unavoidable in many cases, and most phones you can get unlocked are incredibly expensive.
(I'll save you the effort: they don't. None have sufficient market share that anyone would go after them and there are enough BYO provides to look at that there's no way you'll win a claim you don't have choice.)