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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.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
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).
This list contains the mobile country codes (MCC) and mobile network codes (MNC) for networks with country codes between 200 and 299, inclusive. This range covers Europe, as well as: the Asian parts of the Russian Federation and Turkey; Georgia; Armenia; Greenland; the Azores and Madeira as parts of Portugal; and the Canary Islands as part of Spain.
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.
Calling codes in Europe. Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of Denmark have a code starting on number 2, which is most ...
A credit card security code is a three- or four-digit code that’s unique to your card. In case a merchant asks, the security code goes by a few different names , mainly the: Card Verification ...
[1] [2] [3] Today, international mobile airtime recharge is the most widely used mobile phone remittance service. It accounts for nearly 75% of all mobile remittance transactions. [ 4 ] The proliferation of retailers selling mobile airtime remittance services has increased in developing countries, partly due to the growth of various mobile ...