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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 ...
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.
Supplementary service codes. 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.
Public switched telephone network. The public switched telephone network ( PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber-optic cables, microwave transmission ...
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
The 30 code was reserved for those who had been drafted from outside the United States with the third number following the "30" determining the extra-US draft location. The extra-US draft codes which were established were 30 1 (Hawaii), 30 2 (Panama), 30 3 (the Philippines), and 30 4 (Puerto Rico).
In India, mobile numbers (including pagers) on GSM, WCDMA, LTE and NR networks start with either 9, 8, 7 or 6.Each telecom circle is allowed to have multiple private operators; earlier it was two private + BSNL/MTNL, subsequently it changed to three private + BSNL/MTNL in GSM; now each telecom circle has all four operators including Reliance Jio, Bharti Airtel, Vodafone idea ltd and BSNL/MTNL.
GSM 03.38. 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). The 3GPP TS 23.038 standard (originally GSM recommendation 03.38) defines GSM 7-bit default alphabet which is mandatory for GSM handsets ...