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GSM, (Global System for Mobile Communications) is de meest gebruikte standaard voor mobiele telefonie in de wereld. Ook Neo1973 maakt gebruik van deze standaard. Mogelijk gaan toekomstige telefoons een nieuwe of andere standaard gebruiken, uit de huidige generatie mobiele telefoons maken de meeste echter gebruik van de grootste standaard: GSM.

GSM maakt het maken van telefoongesprekken, zenden van SMS en internetverbinding via GPRS mogelijk. Een SIMkaart (Subscriber Identity Module)wordt door een mobiele telefonie provider aan de gebruiker verstrekt bij een abonnement- of prepaiddienst van deze provider. De kaart maakt, na in een mobiele telefoon gedaan te zijn, het bellen met deze telefoon mogelijk.

The card is plastic (approximately 15mm*23mm*1mm) with 8 electrical contacts on. Its main purpose is identifying for the phone, the relationship between the contractor and the operator. This includes information about the mobile phone number, the home network, sms center phone number etc. The user (i.e. phone) usually has some amount of storage available on the card for a simple phonebook. SIM cards are standard ISO/IEC 7816 smart cards with a special SIM application on it.

The Neo1973 phone should work with any operator that has a GSM network (see Neo1973 compatible cellphone providers); 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.

According to User:roh on #openmoko, the 850 band doesn't work with the current GSM chips. This is being worked on. This means that if you're in the US or Canada there is a good chance it will simply mysteriously not work for you.


Calls can be placed using the graphical Dialer or the textual libgsmd-tool.

Rest needs to be done on the command-line manually using GSM and manually using GPRS, until gsmd supports more.


The GSM features (including dialing, SMS, GPRS, and SIM access) will be programmed via gsmd.

Standards information

You can find a full list of GSM/3GPP standards at this ETSI site (attention! more than 2000 entries) or at the light-weight ETSI site.

GSM 02.07 - Required features

See GSM02.07.

GSM 07.07 - Main AT commands

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.

Note that the descendant of this specification is 3GPP TS 27.007 - AT command set for User Equipment (UE). (Does OpenMoko support any of these newer versions?)

GSM 07.05 - Additional AT commands (SMS and CBS)

A more user-friendly resource is:

GSM 07.10 - Multiplexing