Wrong. That's an online retailer with erroneous pre-release specs. Do a search here. Topic has been covered. . All N900 units ship with the same frequencies. It's a quad band GSM device. It will "work" everywhere as a voice phone. Data will work at 2.5G (EDGE) speeds everywhere. The ongoing 900, 1700 and 2100Mhz frequency discussions concern the 3G data connection.
They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...