EW50 Industrial LTE Cellular Gateway
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7.1.4 USSD
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.
An USSD message is up to 182 alphanumeric characters in length. Unlike Short Message Service (SMS)
messages, USSD messages create a real-time connection during an 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.
USSD Scenario
USSD allows you to have an instant bi-directional
communication with the carrier/ISP. In the diagram, the
USSD command ‘*135#’ refers to data roaming services.
After sending that USSD command to carrier, you can get
a response at window USSD Response. Please note the
USSD command varies for different carriers/ISPs.
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