Overview#Mobile Global Title (MGT) is defined in E.214 as of variable length and composed of decimal digits arranged by two parts the E.164 and the E.212 part.
Mobile Global Title is used in Signalling Connection Control Part (SCCP) as a Unique Identifier and address for use within the Public Land Mobile Networks (PLMNs), and to establish the relationship between the Mobile Global Title and the International Mobile Subscriber Identity (IMSI) (E.212).
The E.164 part is used to identify the country and the Public Land Mobile Network, or Public Land Mobile Network and Home Location Register, where the mobile subscriber is registered. To accomplish this, the E.164 part comprises a Country Code (CC) as defined in ITU-T Rec. E.164 and a Network Code (NC). The NC can be the E.164 National Destination Code (NDC), or some leading digits of the E.164 National (Significant) Number (N(S)N). The NC would identify the Public Land Mobile Network or Home Location Register within the Public Land Mobile Network. The number of E.164 digits required for identification may vary from network to network, and must be established by bilateral agreement.
Mobile Global Title is derived from the International Mobile Subscriber Identity (E.212) in the manner shown in two methods is dependent upon whether the E.164 Country Code is a country code used in an integrated numbering plan. If the E.164 Number Plan Area is from an integrated numbering plan, that must be utilized to distinguish between providers within that Telephone Numbering Plan.