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USSD :: Unstructured Supplementary Service Data

USSD (Unstructured Supplementary Service Data) is a Global System for Mobile (GSM) communication technology that is used to send text between a mobile phone and an application program in the network. Applications may include prepaid roaming or mobile chatting.

LeibICT_USSD_S-gateway1

Unstructured Supplementary Service Data (USSD) is a protocol used by GSM cellular telephones to communicate with the service provider’s computers. USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network

USSD is similar to Short Messaging Service (SMS), but unlike SMS, USSD transactions occur during the session only. With SMS, message scan be sent to a mobile phone and stored for several days if the phone is not activated or within range.

The Wireless Application Protocol (WAP) supports USSD. USSD is defined in the GSM standard documents GSM 02.90 and GSM 03.90.

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