make shure before you yank the radio out the dash the 10 mm bolt(access from removed glovebox with 10 mm deep socket or regular 10 mm socket and extention) is removed or you will damage the motherboard forever. also while you have the glove box off inspect or replace the hvac filter I found leaves and other random items left behind by nature.
If you are refering to the mazda 03-05 the face and radio is together and is held on by a hidden 10mm bolt. I can't confirm for the new 6 since I haven't been as hands on as the pevious years.