hi
this has been done... Arduino Playground - SymbianS60Python
let me just take this opportunity to encourage people to use the Google-machine to find these things, as in:
http://www.google.ca/search?q=arduino+BT+phone
;D
D
PS:the picture on this link: http://tinker.it/now/2006/11/24/arduino-bluetooth-demos/ was taken by some Mellis person, maybe he knows the answer...