This began with the '99 S80 and '01 on up (newer body style) for all other except C70s and X40s which still require codes.
The newer cars radios have no radio codes whatsoever BUT do require software via Volvos dealer Vadis PC to function. Once the SWs in, it works but if you buy a new replacement radio, it requires SW before it'll function and it won't work if ever installed in another car either if different from the car it was removed from (thus useless to theives).