Publicly listed serial numbers are almost always "blacklisted" by EA’s servers. If a code has been used once to register an account, it cannot be used again.
To enjoy the game safely and support the developers, please ensure you purchase a legitimate license from an authorized retailer. need for speed shift 2 unleashed serial number
If you buy a used physical copy, the serial number has likely already been "consumed" by the original owner’s account, making it useless for yours. making it useless for yours.