LST EN 300 957 V7.0.1-2000 Digital cellular telecommunications system (Phase 2+). Unstructured Supplementary Service Data (USSD). Stage 3 (GSM 04.90 version 7.0.1 Release 1998)
2000LST EN 300 957 V7.0.1-2000 Digital cellular telecommunications system (Phase 2+). Unstructured Supplementary Service Data (USSD). Stage 3 (GSM 04.90 version 7.0.1 Release 1998)