Mobile Country Code is part of the International Mobile Subscriber Identity
Some but not all CDMA, iDEN, and satellite mobile networks are identified with an MCC/MNC tuple as well.
Mobile Virtual Network Operator (MVNO) are Mobile Network Operators that do NOT have their own radio access network at all. These MVNOs without their own MCC/MNC (that is, they share the MCC/MNC of their host network) are not listed here.
The ITU-T Recommendation E.212 defines Mobile Country Code as well as Mobile Network Codes.
Mobile Country Code consists of 3 decimal digits and the Mobile Network Codes consists of 2 or 3 decimal digits (for example: MNC of 001 is not the same as MNC of 01).
The first digit of the mobile country code identifies the geographic region as follows (the digits 1 and 8 are NOT used):