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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.
Learn how to dial telephone numbers in the United Kingdom, including the country code +44 and the international access code 00. Find out the different formats, prefixes and numbering plans for geographic and non-geographic numbers.
Learn how UK telephone numbers evolved from manual to automatic exchanges, from local codes to area codes, and from geographic to special services. The web page covers the origins, subscriber numbers, director system, and renumbering exercises of UK telephone numbers.
Cipher algorithms and cryptographic hashes can be used as very high-quality pseudorandom number generators. However, generally they are considerably slower (typically by a factor 2–10) than fast, non-cryptographic random number generators.
Find the telephone dialling codes for different areas and services in the United Kingdom, based on the official standard maintained by Ofcom. Learn the history and changes of the UK phone code system, from the international prefix 00 to the area codes 01, 02, and 03.
A hardware random number generator (HRNG) is a device that generates random numbers from a physical process capable of producing entropy. Learn about the history, uses, and types of HRNGs, and how they differ from pseudorandom number generators (PRNGs).
Learn how to dial phone numbers in different European countries and territories, including country codes, national number lengths, and international access codes. Find out the European Union roaming and calling regulations and the harmonized service numbers.
Personal numbering is the name for the virtual telephone number service in the UK.Typically the national destination code used for this service is (0)70.The service provides a flexible virtual telephone number able to be routed to any other number, including international mobiles.