The service programming code (SPC) is a lock code that prevents you from accessing the programming menu on a CDMA phone. A CDMA phone actually has two SPC codes, a default code for one-time use, and a permanent code called the master subsidy lock (MSL). Both codes are six digits long. The default SPC allows a representative to program the phone the first time without having to look up the code. Once the default SPC is used, the phone switches over to the MSL.
