i stronlgy disagree.

it all depends on the actual regulations of course, but to give you an example:
since telcos were forced by austrian law to unlock any device you bought from them, competition has become far more intense, because now they have to price new subsidized phones even more aggressively.

but the most important thing for the US would be to consolidate 3G frequencies. that's IMHO the main reason for the market being so uncompetitive. if every carrier shared the same frequency-bands, customers would have a REAL choice. until then, they don't.