ETSI
The European Telecommunications Standards Institute (ETSI) is an independent, not-for-profit, standardization organization in the field of information and communications. ETSI supports the development and testing of global technical standard ...
and
3rd Generation Partnership Project (3GPP) standards, such as
GSM
The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such ...
and
LTE, define supplementary service codes that make it possible to query and set certain service parameters (''e.g.,''
call forwarding
Call forwarding, or call diversion, is a telephony feature of all telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is ...
) directly from mobile devices.
See also
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Global System for Mobile Communications
The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation ( 2G) digital cellular networks used by mobile devices such as ...
*
GSM services: Supplementary Services
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Vertical service code
A vertical service code (VSC) is a sequence of digits and the signals star (*) and number sign (#) dialed on a telephone keypad or rotary dial to enable or disable certain telephone service features. Some vertical service codes require dialing of ...
*
GSM USSD codes - Unstructured Supplementary Service Data: list of standard GSM codes for network and SIM related functions
External links
3GPP TS 22.030GSM Feature Codes
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Mobile telecommunications standards
3GPP standards