Hello Propergood, welcome to Talk3G

That's really strange :| They could be talking out of their backsides... if the usual ways of setting a ringtone on the handset wont allow MP3's and Vodafone don't feel at liberty to tell you 'the other way' then I'm a little bemused.

I think MMF files work OK on the 902, so you could always use the various freeware tools available online to convert from MP3 to MMF. You might have to go via another format such as WAV, but there's a good chance you'll end up with a usable ringtone.

A quick google found this archive which may come in useful. Basically adding DRM to your MP3 files can be used to fool Vodafone's restrictions into letting you use your own music.

I hope that helps, a little!