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2. 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.

3. Comparison of cross-platform instant messaging clients

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

   Messaging services can operate around different models, based on security and accessibility considerations. [154] 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 ...

4. Instant messaging - Wikipedia

   en.wikipedia.org/wiki/Instant_messaging

   A classic example of instant messaging on a desktop computer: the left window of this software showing a list of contacts ("buddy list") and the right window an active IM conversation An example of instant messaging on mobile, featuring the exchange of pictures and audio on top of text

5. Signal (software) - Wikipedia

   en.wikipedia.org/wiki/Signal_(software)

   Signal is an open-source, encrypted messaging service for instant messaging, voice calls, and video calls. [14] [15] The instant messaging function includes sending text, voice notes, images, videos, and other files. [16] Communication may be one-to-one between users or may involve group messaging.

6. Windows Messenger service - Wikipedia

   en.wikipedia.org/wiki/Windows_Messenger_service

   The Messenger service in Windows 2000 and Windows XP uses the NetBIOS over TCP/IP (NetBT) protocol. The service waits for a message, then it displays it onscreen. The alternative way to send a message is to write it to a MailSlot named messngr. It requires UDP ports 135, 137, and 138 and TCP ports 135, 139, and 445 to work.

7. Threema - Wikipedia

   en.wikipedia.org/wiki/Threema

   In addition to text messaging, users can make voice and video calls, send multimedia, locations, voice messages, and files. [12] A web app version, Threema Web, can be used on desktop devices, but only as long as the phone with the Threema installation of the user is online. There is a beta for iOS users, where it is possible to take the phone ...