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 messages are up to 182 alphanumeric characters in length. Unlike Short Message Service (SMS) messages, USSD messages create a real-time connection during a USSD session that remains open, allowing a two-way exchange of a sequence of data. This makes USSD more responsive than services that use SMS.
The result is an exceptionally fast connection between the user and an application. This makes it an ideal choice in any menu-based transaction or service.
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