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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.
An area code of three digits dialed after the country code determines the area served in the United States and its territories, Canada, and much of the Caribbean. Zone 2 uses two 2-digit codes (20, 27) and eight sets of 3-digit codes (21x–26x, 28x, 29x), mostly to serve Africa , but also Aruba , Faroe Islands , Greenland and British Indian ...
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.
So entering *20*1234# <SEND> or *21*1234# <SEND> would do two completely different things: The first code would be sent as-is to the network for further processing (most likely returning an error), while the second code would be parsed by the phone and a structured request for activation of call forwarding would be sent to the network.
example 971 500 000 000 with country code is 12 digits 52: Du: example 971 520 000 000 with country code is 12 digits 53: Virgin Mobile: example 971 530 000 000 with country code is 12 digits 54: Etisalat: example 971 540 000 000 with country code is 12 digits 55: Du: example 971 550 000 000 with country code is 12 digits 56: Etisalat
Mobile country code Country ISO 3166 Mobile network codes National MNC authority Remarks 289 A Abkhazia GE-AB List of mobile network codes in Abkhazia MCC is not listed by ITU 412 Afghanistan AF List of mobile network codes in Afghanistan 276 Albania AL List of mobile network codes in Albania 603 Algeria DZ List of mobile network codes in Algeria 544 American Samoa (United States of America ...
Call forwarding, or call diversion, is a telephony feature of all telephone switching systems which redirects a telephone call to another destination, which may be, for example, a mobile or another telephone number where the desired called party is available. Call forwarding was invented by Ernest J. Bonanno.
UNDP country code. MTN. WMO country code. M4. ITU callsign prefixes. 4OA-4OZ