How do you unlock a Volvo radio?

If the radio is showing "code", you should have a code with the paperwork for the car, if not, call a Volvo dealer and give them the vin number, they can look it up and you just enter it using the preset radio buttons. This has to be done any time you disconnect the battery for extended amount of time or remove radio. When I called the dealer to get my code, I had to fax a copy of the registration and my ID to prove I owned the car and it wasn't stolen. Just a heads up.