1996ETSI GSM 04.11-1996 Digital Cellular Telecommunication System (Phase 2+); Point-to- Point (PP) Short Message Service (SMS) Support on Mobile Radio Interface
1995ETSI GSM 04.11-1995 Digital Cellular Telecommunication System (Phase 2+); Point-to-Point (PP) Short Message Service (SMS) Support on Mobile Radio Interface (GSM 04.11)