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3GPP AT Commands Guide

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Introduction: 3GPP AT commands control cellular modems through text strings
GSM has market share in over 219 countries
GSM modules work like modems, sending data and making calls
GPRS module offers data services beyond basic calls
3GPP and AT Commands: 3GPP is global telecommunication standards project covering 2G to 5G
AT commands start with "AT" meaning "Attention Terminal"
Commands control modems via RS-232 or USB 2.0
Four main command types: Set, Read, Test, Execute
Key Functions: Basic information commands check modem response and SIM status
SMS commands manage message storage and sending
Phonebook commands handle contact management
Security commands control device and SIM card settings
Connecting commands manage calls and data operations
Applications: Used in vehicle fleet management and tracking
Essential for texting and internet usage
Helps configure and manage modern mobile networks
Improves compatibility between different modems