Unstructured Supplementary Service Data (USSD) is a communication protocol used by GSM cellular telephones to communicate with the service provider’s computers. USSD can be used for a variety of services, such as checking account balances, recharging credit, and activating or deactivating services. It is a session-based protocol, meaning that a session is established between the user’s phone and the service provider’s computer, and all subsequent messages between the two are part of that session. USSD is often used in areas where the availability of internet access is limited.
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