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2. Textfree - Wikipedia

   en.wikipedia.org/wiki/Textfree

   TextFree (formerly called Pinger and sometimes stylized as textfree) is a mobile application and web service that allows users to send and receive text messages, as well as make and receive VoIP phone calls, for free over the internet. The service costs nothing because it is supported by ads, but users have the option of paying for an ad-free ...

3. FreeSWITCH - Wikipedia

   en.wikipedia.org/wiki/FreeSWITCH

   FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media. The software has applications in WebRTC, voice over Internet Protocol (VoIP), video transcoding, Multipoint Control Unit (MCU) functionality and supports Session Initiation Protocol (SIP) features.

4. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

5. Viber VoIP iPhone app: 3G calling, no registration, and ... - AOL

   www.aol.com/news/2010-12-04-viber-voip-iphone...

   Out of nowhere, Viber has swooped in to crush the dreams of Skype and every other VoIP provider out there, and if these guys can reach critical mass, avid iPhone users will certainly be able to ...

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. Talkatone - Wikipedia

   en.wikipedia.org/wiki/Talkatone

   Talkatone is a mobile application providing free domestic calling and texting, [1] available on both iOS and Android platforms. [2] The app leverages VoIP (Voice over Internet Protocol) technology to enable communication over Wi-Fi [1] and mobile data. [3]