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USSD on a Sony Ericsson mobile phone (2005). 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.
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.
Former Westel; MNC has the same numerical value as the area code; [11] [2] UMTS shut down June 2022 [164] 216: 70: Vodafone: Vodafone Magyarország Zrt. Operational: GSM 900 / LTE 800 / LTE 1800 / LTE 2600 / 5G 700 / 5G 2100 / 5G 3500: MNC has the same numerical value as the area code; [11] [2] UMTS shut down Mar 2023 [165] 216: 71: upc ...
USSD gateway is based upon the ability of the delivery agent or the source to send and receive USSD messages. A USSD is a session-based protocol. A USSD is a session-based protocol. USSD messages travel over GSM signalling channels, and are used to query information and trigger services.
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).
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.
Vertical service code Service definition Australia Japan UK Tone dialing Pulse dialing *51 1151 Who called me. Provides the directory number, date and time of unanswered calls. *52 1152 Call Hold (Single Line Variety Package). Permits the call to be picked up at another station. *53 1153