ChatOn

This app is marketed by the Tech giant Samsung, and comes pre-loaded in the device. However, this app does not come with a video calling feature and you can start using it by signing through Samsung account wherein you would get a verification code. 

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It provides unlimited Text Messages, audio messages and more interestingly unlimited voice calling which is free of cost. The best capability of this app is that it allows one to reply messages on the desktop too. This could be the right choice for present users, because it comes free with excellent features and more users.

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