GSM

GSM (Global System for Mobile Communications, originally Group Spécial Mobile), is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for second generation (2G) digital cellular networks used by mobile phones.

AT command set for GSM Mobile Equipment

Adapted from

http://www.etsi.org/deliver/etsi_gts/07/0707/05.00.00_60/gsmts_0707v050000p.pdf (GSM 07.07 Version 5.0.0)
http://www.etsi.org/deliver/etsi_ts/127000_127099/127005/04.01.00_60/ts_127005v040100p.pdf (3GPP TS 27.005 Version 4.1.0 Release 4)

Command	Purpose
ATZ	Sets all parameters to their defaults
ATI	Requests manufacturer specific information
AT+GMI	Requests manufacturer identification
AT+GMM	Requests model identification
AT+GMR	Requests revision identification
AT+GSN	Requests serial number
AT+CPIN	Enter PIN
AT+CMGF	Message format to use
AT+CMGL	List messages
AT+CMGD	Delete message

== SMS PDU Encode Decode== http://twit88.com/home/utility/sms-pdu-encode-decode