1.1 Circuit‐Switched Data Transmission1.2 Standards1.3 Transmission Speeds1.4 The Signaling System Number 71.5 The GSM Subsystems1.6 The Network Subsystem1.7 The Base Station Subsystem (BSS) and Voice Processing1.8 Mobility Management and Call Control1.9 The Mobile Device1.10 The SIM Card1.11 The Intelligent Network Subsystem and CAMELQuestionsReferences