Overview#Reporting Body Identifier is a number Unique Identifier that indicates the GSMA-approved organization that registered (or, before 2002, approved) a given Mobile Device.
Reporting Body Identifier numbers are loosely based on the telephone Country Code (CC) of the organization identified, as most approving nations used a single approval body endorsed by their national GSM Association chapter. However, not all Reporting Body Identifiers follow this tendency.
Reporting Body Identifier is also known as the "Regional Code" in the CDMA context. The International Mobile Station Equipment Identity (IMEI) use first two digits MUST be decimal and Mobile Equipment Identifier (MEID) MUST be hexadecimal