Some of the T-Mobile handsets have this. Many don't. None of the ATT handsets have the 3g problem.
Karl's post was inaccurate at best with regards to the specifics too. Namely that T-Mobile wasn't the only way to get the phone. It was the only way to get a SUBSIDIZED phone. -- "What makes us omniscient? Have we a record of omniscience? ...If we can't persuade nations with comparable values of the merit of our cause, we'd better reexamine our reasoning." -United States Secretary of Defense (1961-1968) Robert S. McNamara
You're kidding, right? I have a Nexus One with AT&T 3G bands and it has by far the worst antenna/radio design I've ever dealt with. The phone randomly drops from 4 bars (which is "full" strength under Android" to no signal whatsoever and no data - all without being moved out handled.
I love my Nexus One, but the antenna/radio is godawful.