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The service does not require a messaging app, and does not incur charges. [2] 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.
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.
ETSI and 3rd Generation Partnership Project (3GPP) standards, such as GSM and LTE, define supplementary service codes that make it possible to query and set certain service parameters (e.g., call forwarding) directly from mobile devices.
In mobile telephony GSM 03.38 or 3GPP 23.038 is a character encoding used in GSM networks for SMS (Short Message Service), CB (Cell Broadcast) and USSD (Unstructured Supplementary Service Data).
USSD (Unstructured Supplementary Service Data) codes [1] are mobile dial codes that can be used for communicating with the service provider's computers (i.e. 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).
This is a poor article because it does not say what USSD actuall *is*. It says it is "a capability of all GSM phones", and is "generally associated with real-time or instant messaging type phone services", and that it has "no store-and-forward capability such as is typical of other short-message protocols" - but none of these tell me what it *actually is* - except for the last statement, which ...
Interaction between a user and a service using announcements, voice prompting and information collection via in-band interaction or Unstructured Supplementary Service Data (USSD) interaction; Control of call duration and transfer of Advice of Charge Information to the mobile station;
By the end of May, 2014, more than 1000 government bodies from all over India had integrated their services through Mobile Seva, this integration was enabled through various methods such as text messages, mobile applications, Unstructured Supplementary Service Data, and Interactive Voice Response System.