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  2. Telephone numbers in Brazil - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Brazil

    Despite this fact, mobile phones registered outside the 11–19 , 21, 22, 24 (Rio de Janeiro) and 27–28 (Espírito Santo) areas are usually displayed on WhatsApp (widely used by Brazilians to send text, voice and video messages due to the privileged access granted by mobile operators, in contrast to the assumption of network neutrality ...

  3. Oi (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Oi_(telecommunications)

    Oi Internet is an ISP that was launched in 2004. Oi Internet started services with a promotion that offered 31% off the dial-up connection costs on the subscriber's bill. However, Anatel, the Brazilian telecom regulator, did not allow this practice. Later, the ISP relaunched the promotion, offering 31% of the dial-up connection costs deposited ...

  4. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [13] It allows users to send text, voice messages and video messages, [14] make voice and video calls, and share images, documents, user locations, and other content.

  5. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    From a landline, these are free. From cell phones, airtime is not covered, but there are no long-distance charges. In Chile, the toll-free prefix is "800" followed by a six-digit number. These numbers are called número 800 (800 number). These numbers cannot be accessed from abroad. In Colombia, toll-free numbers start with "018000".

  6. File:Mapa de cobertura da Oi Fixo.svg - Wikipedia

    en.wikipedia.org/wiki/File:Mapa_de_cobertura_da...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate

  7. Digital object identifier - Wikipedia

    en.wikipedia.org/wiki/Digital_object_identifier

    A DOI is a type of Handle System handle, which takes the form of a character string divided into two parts, a prefix and a suffix, separated by a slash.. prefix/suffix. The prefix identifies the registrant of the identifier and the suffix is chosen by the registrant and identifies the specific object associated with that DOI.

  8. No-communication theorem - Wikipedia

    en.wikipedia.org/wiki/No-communication_theorem

    In physics, the no-communication theorem (also referred to as the no-signaling principle) is a no-go theorem in quantum information theory. It asserts that during the measurement of an entangled quantum state , it is impossible for one observer to transmit information to another observer, regardless of their spatial separation.

  9. .no - Wikipedia

    en.wikipedia.org/wiki/.no

    .no is the Internet country code top-level domain (ccTLD) for Norway. Norid , the domain name registry , is based in Trondheim and is owned by the state-owned Uninett and operates under supervision of the Norwegian Communications Authority .