Dear Sir,
I am Symbian experienced developer, where I worked for Symbian Platform for the past 3 years out of my 10 years of experience, and have no problem with your specs, since I alreay did many things in voice recording, AMR, GPS over BT, and using CellID, and currently manage Symbain based project for some swiss partner, The only problem I have is although I have much of the required functionality ready from pervious project, but i will be so slow because I already engaged into other projects. but if you are willing to pay well, I can manage that.
Kind regards,
Ahmed.