WhatsApp is the largest messaging app with more than 600 million active users. After introduction of the voice call facility, it will directly compete with the major service providers like Line, Viber, WeChat, etc, which are already featuring these services.
About WhatsApp:
WhatsApp Messenger is an instant messaging app for smartphones that operates under a subscription business model. The proprietary, cross-platform app enables users of select feature phones to use the Internet to transmit communication. In addition to text messaging, WhatsApp can be used to send images, video, and audio media messages. Locations can also be shared through the use of integrated mapping features. WhatsApp Inc. was founded in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo!. The company is based in Mountain View, California and employs 55 people. It is in the process of takeover after Facebook announced its acquisition of WhatsApp Inc. on February 19, 2014, for US$19 billion Read more on Wikipedia.
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