I have seen a lot of posts about the SPC, or Service Programming Code. The SPC is a code in most CDMA handsets used to lock that specific handset. The SPC is required when programming a new MDN, MIN, home SID, etc. into a handset. Usually, the default SPC, 000000, works only once for the initial programming of the handset at the sales office. Most carriers will not give out SPCs. You cannot get the SPC from the manufacturer of the phone (Motorola, Samsung, Nokia, etc.) Each handset has it's own SPC so the SPC for one phone won't work on another handset, even if they are the same model. GSM handsets do not have an SPC, they have a SIM unlock code, which is similar. The SIM unlock code prevents the SIM card from another carrier from being used in a branded, locked handset. For example, you cannot take a Cingular SIM card and put it in a locked, branded T-Mobile handset unless you have the unlock code. T-Mobile will give you the unlock code for one handset, per line, per 90 days of active service. I do not believe any other GSM provider will give you the unlock codes for their handset.