Hi guys I have a few in car issues

1, the car is a left hand drive originally german, the in car computer is in german and I want to know how difficult it is for me to change the language to english.
2, there is a message on the radio saying deck error, and a compact disc is stuck in the 6 disc changer how do I get this disc out, does the radio have to come out?
3, on the the console an airbag sign is light up in red can you plug into the car and resolve this problem
4, the car has an incar telephone and i tried to change the sim card in it to an pay as you go card but the phone is locked out with a code that I do not have and cannot get. can this be resolved so that I can use the phone