Emavil,

1. I believe you can do it on the F628A.
2. Simply go through the Compiler Manual and you shall know about the Debug statement. I used the debug statement to save on code space.
3. Modem ? No I am using a Industrial type Mobile which has a Serial Port control and accepts AT commands. Type Simmcom. Yes , I you see this month's EPE magazine , you will come across a similar project using the Nokia phones.

regards