I know what the cell phone code is. The problem is with the Avalon......system will not let me change the code unless I have first registered the cell phone which requires that I input the specified Avalon code.......In other words, the Avalon system will only allow you to change a code after being set up properly to begin with. This obviously makes no sense to me but that's the way the system appears to work. I have contacted Toyota and for three days their supposed tech expert has been trying to figure out what to do with no success. The bottom line is that Toyota has failed to address the pre-paid cell phone market which, in many cases, uses fixed codes. Thanks for your suggestions but I'll probably give up the idea of using my Tracfone in the Toyota Hands Free environment unless their tech comes up with a miracle solution.