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  2. One-time password - Wikipedia

    en.wikipedia.org/wiki/One-time_password

    Mobile phone. A mobile phone itself can be a hand-held authentication token. Mobile text messaging is one of the ways of receiving an OTAC through a mobile phone. In this way, a service provider sends a text message that includes an OTAC enciphered by a digital certificate to a user for authentication.

  3. Telephone numbers in Serbia - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Serbia

    Overview. The country calling code of Serbia is +381. Serbia and Montenegro received the code of +381 following the breakup of the Socialist Federal Republic of Yugoslavia in 1992 (which had +38 as country code). Montenegro switched to +382 after its independence in 2006, so +381 is now used only by Serbia. [2]

  4. Transaction authentication number - Wikipedia

    en.wikipedia.org/wiki/Transaction_authentication...

    A transaction authentication number ( TAN) is used by some online banking services as a form of single use one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication . TANs provide additional security because they act as a form of two-factor ...

  5. Mobile phone jammer - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_jammer

    A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from transmitting them.

  6. Telephone numbers in Costa Rica - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Costa...

    Prefix 00 was reserved for international calls, while prefix 9 was assigned to special numbers, such as 911. Toll-free numbers start with 800 followed by 7 digits while premium-rate numbers start with 900 followed by 7 digits. Before 1994, all phone numbers in Costa Rica were six digits long.

  7. Telephone numbers in Nigeria - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Nigeria

    0, 009. Telephone numbers in Nigeria use an open numbering plan. They are composed of a combination of an area code and a local line or subscriber telephone number. Area codes consist of one digit ( Lagos, Ibadan and Abuja) or two digits. Local telephone numbers contain from five to seven digits, and may vary within the area code.

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