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2. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   Upon installation, it creates a user account using the user's phone number as the username (Jabber ID: [phone number]@s.whatsapp.net). WhatsApp software automatically compares all the phone numbers from the device's address book with its central database of WhatsApp users to automatically add contacts to the user's WhatsApp contact list.

3. Timeline of WhatsApp - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_WhatsApp

   Timeline of WhatsApp. The following is a timeline of WhatsApp, a proprietary cross-platform, encrypted, instant messaging client for smartphones. [1] Jan Koum incorporates WhatsApp in USA. [2] WhatsApp 2.0 is released on the App Store for the iPhone. [3]

4. Comparison of cross-platform instant messaging clients

   en.wikipedia.org/wiki/Comparison_of_cross...

   A mobile-focused, phone number-based model operates on the concept of primary and secondary devices. Examples of such messaging services include: WhatsApp , Viber , Line , WeChat , Signal , etc. The primary device is a mobile phone and is required to login and send/receive messages.

5. Telephone numbers in Russia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Russia

   Telephone numbers in Russia are administered by Roskomnadzor, and Ministry of Digital Development, Communications and Mass Communications of the Russian Federation. Russia's National Numbering Plan (NNP) is a four-level telephone numbering plan with local, zone, country, and international scopes, implementing a closed numbering plan, in which the number of digits of all national significant ...

6. Instant messaging - Wikipedia

   en.wikipedia.org/wiki/Instant_messaging

   Instant messaging is a set of communication technologies used for text-based communication between two ( private messaging) or more (chat room) participants over the Internet or other types of networks (see also LAN messenger ). [6] IM chats happen in real-time.

7. Telephone numbers in Brazil - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_Brazil

   To call the number (19) 4001-3579 from a payphone in Piracicaba (within area 19, but outside the metropolitan region of Campinas): 0 XX 19 4001 3579. To call the number (19) 4001-3456 from a cell phone working in Rio Claro (also outside the Metropolitan Region of Campinas, but also in area 19 ): 4001 3456.

8. Signal Protocol - Wikipedia

   en.wikipedia.org/wiki/Signal_Protocol

   Website. signal .org /docs. The Signal Protocol (formerly known as the TextSecure Protocol) is a non- federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2] The protocol was developed by Open Whisper Systems in 2013 [2] and was introduced in the open-source TextSecure app, which ...

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

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

   The report found that it would be therefore possible to add arbitrary phone numbers to a group chat such that future communication becomes insecure. In October 2017, the German software company Open-Xchange criticized WhatsApp, among others, for using proprietary software and stated plans to create an open-source alternative.