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2. Wi-Fi calling - Wikipedia

   en.wikipedia.org/wiki/Wi-fi_calling

   Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet , while ...

3. Comparison of user features of messaging platforms - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_user...

   Duo is based on phone numbers, allowing users to call someone from their contact list. The app automatically switches between Wi-Fi and cellular networks. A "Knock Knock" feature lets users see a live preview of the caller before answering. An update in April 2017 lets users worldwide make audio-only calls.

4. Viber - Wikipedia

   en.wikipedia.org/wiki/Viber

   In addition, version 4.0 introduced push-to-talk capabilities, and Viber Out, a feature that provides users the option to call mobile and landline numbers via VoIP without the need for the application. [87] Voice support was officially added for all Windows Phone 8 devices on 2 April 2013. [88]

5. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e.g., have a PSTN phone number in a New York ...

6. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   These solutions typically allow dynamic interconnection between users in any two domains of the Internet, when a user wishes to place a call. In addition to VoIP phones, VoIP is also available on many personal computers and other Internet access devices. Calls and SMS text messages may be sent via Wi-Fi or the carrier's mobile data network. [4]

7. 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.