FYI. Just documenting to help the next person ...
Symptom - The car started fine, but was stuck in park. The radio didn't work.
Temporary solution - There is a plastic plug on top of the steering column. Pop it off and insert a key in the slot. This releases the shifter. Move it to neutral, start the car, and shift to drive.
Real Solution - The "cigar" fuse was blown.
If there's a Mazda designer reading this news group (i.e. time to rant) ...
1 - IMHO, the most likely fuse to blow is the "cigarette lighter" fuse, since all kinds of accessories are plugged in. In this case it was a broken cell phone charger. If I were designing the car, I'd avoid putting any critical function on the same circuit.2 - There is a fuse labeled "audio", but the radio evidently does not use that fuse. That threw me off for a while. If I were writing the owner's manual, I'd list ALL the functions on each fuse, not just one of them.
3 - There are slots on the fuse block for spares, and they are labeled in the owner's manual. But the slots are empty. For a penny a car, you could put in the spares.