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  2. Reception and criticism of WhatsApp security and privacy ...

    en.wikipedia.org/wiki/Reception_and_criticism_of...

    In May 2012 security researchers noticed that new updates of WhatsApp sent messages with encryption, [40] [41] [42] but described the cryptographic method used as "broken." [43] [44] In August of the same year, the WhatsApp support staff stated that messages sent in the "latest version" of the WhatsApp software for iOS and Android (but not BlackBerry, Windows Phone, and Symbian) were encrypted ...

  3. Timeline of WhatsApp - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_WhatsApp

    WhatsApp's user base swells to about 200 million active users and its staff to 50. [2] 2013: July: Funding: Sequoia invests another $50 million in Series B round, valuing WhatsApp at $1.5 billion. [9] 2013: July 16: Product: WhatsApp goes free, with an annual subscription fee of $1 after the first year. [10] [11] 2013: August: Competition

  4. Anonymous call rejection - Wikipedia

    en.wikipedia.org/wiki/Anonymous_call_rejection

    In many voice telephone networks, anonymous call rejection (ACR) is a calling feature implemented in software on the network that automatically screens out calls from callers who have blocked their caller ID information. The caller usually hears a voice message explaining that their call cannot be connected unless they display their number.

  5. Call blocking - Wikipedia

    en.wikipedia.org/wiki/Call_blocking

    Call blocking, also known as call block, call screening, or call rejection, allows a telephone subscriber to block incoming calls from specific telephone numbers. This feature may require an additional payment to the subscriber's telephone company or a third-party. Call blocking is desired by individuals who wish to block unwanted phone calls.

  6. 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.

  7. Facebook - Wikipedia

    en.wikipedia.org/wiki/Facebook

    Download as PDF; Printable version ... Sri Lanka blocked both Facebook and WhatsApp in May 2019 after ... The phone numbers of at least 200 million Facebook users ...

  8. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    If a phone receiver is left off-hook, some phone systems may use an intercept message to inform callers to hang up their phone receivers. The most common message reads as follows: If you'd like to make a call, please hang up and try again. If you need help, hang up and then dial your operator. A formerly-used variation of this message was as ...

  9. Geo-blocking - Wikipedia

    en.wikipedia.org/wiki/Geo-blocking

    Geo-blocking can be circumvented.When IP address-based geo-blocking is employed, virtual private network (VPN) and anonymizer services can be used to evade geo-blocks. A user can, for example, access a website using a U.S. IP address in order to access content or services that are not available from outside the country.