You pass your traffic through their proxy. They could be doing things like watching the browser's signature to see whether or not you're using the built-in browser, vs. a desktop browser. I mean, if you've got Safari or Internet Explorer signature tags in your traffic, that's pretty clearly not your N900 :-)
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...