You must determine yourself if your handset can be unlocked before purchasing as this money cannot be refunded if you did not check first. The simple way to identify whether a Nokia is unlocked or not is to, insert a different network sim into the mobile. If the mobile displays "sim restricted" or "enter unlock code" or "emergency calls only" then it is locked. If the inserted sim card is accepted and starts working for calling, then it is unlocked. If not accepted your mobile is locked and you need to buy the unlocking code service.
Your code will be emailed to you via your email address within the advertised time frame.