USSD-Codes (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "USSD-Codes" in German language version.

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etsi.org

European Telecommunications Standards Institute: GSM 02.30 Version 5.3.0: July 1996. (pdf) Digital cellular telecommunications system (Phase 2+); Man-Machine Interface (MMI) of the Mobile Station (MS). In: Global System for Mobile communications (GSM) (etsi.org). Juni 1996, S. 30, abgerufen am 17. September 2014 (englisch): „In temporary mode, to suppress CLIR for a single call, enter: " * 31 # <called number> SEND ". In temporary mode, to invoke CLIR for a single call enter: " # 31 # <called number> SEND "“