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Learn about the history, methods and effects of caller ID spoofing, a practice that causes the telephone network to display a fake phone number or name to the receiver of a call. Find out how caller ID spoofing can be used for pranks, scams, frauds and other malicious purposes.
User being asked to dial a number or a send a message which helps the server identify that the number is genuine and valid. With the advent of smartphones, type 0 or type 1 SMS are also being employed to send the codes which are used to verify the genuine user. Soft tokens generated within the smartphone or push messages can also be used.
Learn how to dial phone numbers in Indonesia, including the country code +62 and the area codes for land lines and mobile phones. Find out the history, operators, formats and prefixes of Indonesian phone numbers.
Learn about the different types of non-geographic numbers in the UK, such as 0808, 03, 084, 087 and 09. Find out how they work, how they are charged and how to call them from abroad.
Learn why the correct area code for London is 020, not 0207, 0208 or 0203. Find out the history and background of UK telephone numbering system and its changes over time.
Operator assistance refers to service provided by a telephone operator to the calling party of a telephone call.This can include telephone calls made from pay phones, calls placed station-to-station, person-to-person, or collect, third-number calls, calls billed to credit cards, and certain international calls which cannot be dialed directly.
Learn about the three-digit codes that identify geographic regions and mobile network operators in the public land mobile networks. Find a complete list of MCC/MNC tuples for each country and territory, updated as of January 2024.
Learn about the structure, format and history of UK telephone numbers, including the country code 44 and the dialling codes for different regions and services. Find out how to call the UK from abroad and how to use the National Telephone Numbering Plan.