Works for me
I used the "naming Mp3 to .3g2" method, and it work fine for me. I downloaded it to my cell thru the USB cable that came witht he phone. I went to my pics/video, went to my memory card, went to options, copied the file to my cell, then went to my cell and assigned the newley created file to my voice calls...etc.
Scuba, i'm also a Sasktel Customer, so... it should work for you as well.
Another way to do it, if you want, is to use (Xilisoft 3GP Video Converter Wizard 3). You convert any Mp3 Song to an "Actual" .3g2 file (it will only convert the first 2 minutes of the song unless you register it), then use the same method as i described above, you can have a 2 min ringer...(if desirable)