Mobile Country Code (MCC)

They are used in the signaling network and on the SIM (as part of the IMSI) to identify the region from which a mobile subscriber belongs, and are also transmitted by the radio base stations as part of the operator identifier (the other part being the Mobile Network Code (MNC). Mobile County Codes are defined in a standard called ITU-T E.212.

References for the glossary can be viewed by clicking here.