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  2. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Phreaking began in the 1960s when it was discovered that certain whistles could replicate the 2600 Hz pitch used in phone signalling systems in the United States. [3] Phone phreaks experimented with dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure ...

  3. Random number generation - Wikipedia

    en.wikipedia.org/wiki/Random_number_generation

    Dice are an example of a mechanical hardware random number generator. When a cubical die is rolled, a random number from 1 to 6 is obtained. Random number generation is a process by which, often by means of a random number generator (RNG), a sequence of numbers or symbols that cannot be reasonably predicted better than by random chance is generated.

  4. Telephone numbers in Cameroon - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Cameroon

    Old numbers New numbers Service/Carrier [2] +237 2xxxxxx +237 22xxxxxx: fixed, CAMTEL +237 3xxxxxx +237 33xxxxxx: fixed, CAMTEL +237 45xxxxx +237 745xxxxx

  5. Telephone numbers in Portugal - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Portugal

    For special number ranges, formerly ten digits were used, but the initial '0' was dropped. [1] These changes made that nine digits were used for all calls after 1999. [1] Before 1999 Portugal Telecom controlled Portugal's entire landline telephone network. [2]

  6. Telephone numbers in Serbia - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Serbia

    xxx xx xx (phone number in Serbia) 011 xxx xx xx (house number in Belgrade) +381 xx xxx xx xx (outside Serbia) The international call prefix depends on the country being called from: for example, 00 for most European countries and 011 from North America. For domestic calls (within the country), 0 must be dialed before the area code.

  7. Telephone numbers in India - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_India

    The total length of all phone numbers (area code and the phone number) is constant at 10 digits. For example, the number 7513200000 signifies the area code 751 (the area code for Gwalior) followed by the phone number. Fixed-line or landline numbers are at most 8 digits long.

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