I'm assuming you're not the original owner? Check your owners manual. There may be a card that has the radio code written somewhere on it. That's a typical place to write it down. Otherwise call your Volvo dealer and ask them to provide the code to you. You will give them your VIN and they can look it up. If they tell you that you have to come in, call another dealer. It's not a big deal for them to look it up.