GSM covers making phone calls, sending SMS text messages, and access to Internet via GPRS. A SIM (Subscriber Identity Module) card is given along the contract with an operator, and the customer inserts the card in the phone to authorize it. The card is plastic (approximately 15mm*23mm*1mm) with several gold contacts on, and it determines the mobile phone 'number' and what network the phone is on.
The Neo1973 phone can be used with any operator that has a GSM network; it is quad-band and thus supports every frequency (850, 900, 1800, and 1900 MHz). Thus it will work in most countries, with the exception of some of the US and some other parts of the world that completely lack GSM coverage.
Calls can be placed using XXX?. SMS and GPRS are missing from Gsmd.
The GSM features (including dialing, SMS, GPRS, and SIM access) will be programmed via Gsmd.
Main AT commands: GSM 07.07
07.07 describes the main commands used by the Gsmd software of the Openmoko system to communicate via a serial interface with the GSM subsystem of the phone.
For more, see Hardware:AT Commands.
Additional AT commands (SMS and CBS): GSM 07.05
Multiplexing: GSM 07.10
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