Does the fact that i'm trying to watch Youtube with my 3G data plan connection instead of my wi-fi connection have anything to do with it?

The last time i watched youtube on my n900 was at home using my wi-fi connection (a few weeks back), i tried to watch it on the train (using 3G connection) today but wasn't able to switch to desktop version?

Do you think my mobile operator (vodafone) has anything to do with it?