Section: 3 Numbering plan for mobile stations 3.1 General
Content: The structure of the following numbers is defined below: - the telephone number used by a subscriber of a fixed (or mobile) network to call a mobile station of a PLMN; - the network addresses used for packet data communication between a mobile station and a fixed (or mobile) station; - mobile station roaming numbers. One or more numbers of the E.164 numbering plan shall be assigned to a mobile station to be used for all calls to that station, i.e. the assignment of at least one MSISDN (i.e. E.164 number) to a mobile station is mandatory. As an exception, GPRS and EPS allow for operation whereby a MSISDN is not allocated as part of the subscription data (see 3GPP TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [3] clause 5.3.17 and 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [72]). NOTE: For card operated stations the E.164 number should be assigned to the holder of the card (personal number).