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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.
Montana; former Get Mobile Inc., [85] SmartCall, LLC; acquired by T-Mobile in 2017; [146] MNC withdrawn [112] 310: 310: T-Mobile: Not operational: GSM 1900: Formerly Aerial Communications [82] 310: 311: Farmers Wireless: Not operational: GSM 1900: NE Alabama; acquired by AT&T in 2008 310: 320: Cellular One: Smith Bagley, Inc. Operational: GSM ...
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.
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).
On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11 . In North American telephony , VSCs were developed by the American Telephone and Telegraph Company (AT&T) as Custom Local Area Signaling Services ( CLASS or ...
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).
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Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.