GSM codes for supplementary services
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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 02.030) 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)