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But it is still just an app, a messaging app at that. AFAIK no one I know has ever got the voice call function to work to a minimum standard. So whilst it is a useful and pervasive chat application that's all it really is.

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You're not seeing it. It is, to some or other partial-but-very-noticeable extent, a Skype killer, an SMS killer, a GSM/CDMA voice call killer, an email killer, a Hangouts killer, a Facebook killer (yes i know they bought it), [insert many others here]. Communications are very important, this app is a beast. The voice calls work perfectly for me.

Voice calls on WhatsApp are simply fantastic. I'm not sure how you are measuring, but this is based on my experience in Brazil over Wifi and 3Gish 4G

Yup, WhatsApp voice calls beat Skype, hangouts, FaceTime audio, Slack audio. I don't know why, but I've tried them all. Somehow WhatsApp seems so much better.

Second this. WhatsApp uses the least data and can work well in network connection transition. Most importantly, it is binded to your phone number and can call people regardless of country (unlike Skype) .

If I remember correctly since 2016, WhatsApp is completly free from any fee charge? How is facebook planning to use that? Finally integrate with facebook?

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