wscma2j.app
I did not try it myself but give it a chance it is the only one I heard about!
You can find the info here:
http://www.macbidouille.com/niouzcon...ate=2004-09-30
.. last new on the page.
If your french is not so good it goes something like this:
You can convert AV and AIFF to MMF (mobile phones format)
The link goes to YAMAHA Japan but the soft is in English.
The bug is to manage the Japanese site!
http://smaf-yamaha.com/jp/tools/downloads.html#wscma2sm
the app is called: WSC-MA2-SMAF-MAC
The licence page is aking for your name (1st field) + choose your country in the list then click on the LEFT button.
Good luck!
