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What (who) is USSD - definition

COMMUNICATIONS PROTOCOL

Unstructured supplementary service; Supplementary service string; USSD; USSD codes; USSD code; Ussd; GSM Man-Machine Interface

USSD

UnStructured Supplementary Services (Reference: GSM, mobile-systems)

Banks V. Telcos USSD Dispute

SERVICES CHARGES DISPUTE IN NIGERIA

The use of Unstructured Supplementary Service Data (USSD) for financial transactions such as funds transfer, checking account balance and mobile airtime top-up from private bank accounts gained wide usage in Nigeria in 2015. The USSD services is widely promoted by commercial banks to optimize their financial services to customers and generate more revenue.

https://en.wikipedia.org/wiki/Banks_V._Telcos_USSD_Dispute

USSD Gateway

Unstructured Supplementary Service Data, or USSD is a communication protocol used by GSM cellular telephones to communicate with the service provider's computers. A gateway is the collection of hardware and software required to interconnect two or more disparate networks, including performing protocol conversion.

https://en.wikipedia.org/wiki/USSD_Gateway

Wikipedia

Unstructured Supplementary Service Data

Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator'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 long. Unlike short message service (SMS) messages, USSD messages create a real-time connection during a USSD session. The connection remains open, allowing a two-way exchange of a sequence of data. This makes USSD more responsive than services that use SMS.

https://en.wikipedia.org/wiki/Unstructured Supplementary Service Data

Examples of use of USSD

1. Current subscribers of Mobily may covert their previous packages if they wish by contacting the call center at 1100, or dialing the USSD number 1100 proceeded by a star and followed by hash.