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Learn how telephone numbers are written and dialed in different countries and regions, according to the ITU recommendation E.123. Compare the formats, lengths, prefixes and codes of landline, mobile, toll free and service numbers.
A transaction authentication number (TAN) is a one-time password used by some online banking services to authorize financial transactions. TANs provide additional security as a form of two-factor authentication, but are still vulnerable to phishing, man-in-the-middle and malware attacks.
Learn about the history and usage of fictitious telephone numbers in movies, music and other media. Find out why 555-555-5555 is not a valid number in North America and what are some examples of famous phone numbers.
A telephone number is a sequence of digits assigned to a device or subscriber for communication via the public switched telephone network or other networks. Learn about the history, formats, and functions of telephone numbers around the world.
Phonewords are mnemonic phrases represented as alphanumeric equivalents of a telephone number. Learn about the advantages, disadvantages, and regional variations of phonewords in different countries.
Learn about the telephone number prefixes for reaching foreign countries or areas via international telecommunication networks. Find out the country code for Niger (227) and other countries in different world zones.
Learn about the different types and uses of premium-rate telephone numbers, which charge callers higher prices for select services. Find out how to identify and block these numbers in various countries, including Austria, where 0901 is the prefix for per call tariffs.
Text messaging, or texting, is the act of sending electronic messages between devices. Learn about the origin and evolution of SMS, the Short Message Service that started it all, and how it has grown to include multimedia and instant messaging.
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