GSM codes for supplementary services

Global System for Mobile Communications (GSM) standards define certain codes that (if implemented by the particular carrier) make it possible to query and set certain service parameters (e.g., type of Call forwarding) from mobile devices (GSM cell phones). See ETSI TS 100 907 (3GPP/GSM TS 02.30) at:

• ETSI (European Telecommunications Standards Institute, original GSM standardisation body, free standards download)
• 3GPP (3rd Generation Partnership Project, current standardisation body for GSM, free standards download)

See also

• Global System for Mobile Communications
• GSM services: Supplementary Services
• Vertical service code

External links

• Codes to be used with GSM phones
• GSM Feature Codes
• GSM Features That Aren't Widely Known
• Selection of useful, but hard to remember GSM codes