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'WhatsApp' provides phone number-based messaging, and people asked, 'Isn't that what SMS is?' Yes, but SMS is expensive, antiquated, and what WhatsApp did was modernize and level that playing field.

At WhatsApp, our engineers spend all their time fixing bugs, adding new features and ironing out all the little intricacies in our task of bringing rich, affordable, reliable messaging to every phone in the world. That's our product, and that's our passion. Your data isn't even in the picture. We are simply not interested in any of it.

WhatsApp is both disrupting and demonetizing the entire wireless industry, and now the Facebook acquisition provides the infrastructure needed for WhatsApp to begin offering voice calls. So instead of people paying on average $80 per month, users only have to pay $0.99 per year for the same services. Wireless carriers, beware.

'WhatsApp' began as a simple idea: ensuring that anyone could stay in touch with family and friends anywhere on the planet, without costs or gimmicks standing in the way.

I think we basically saw that the messaging space is bigger than we'd initially realized, and that the use cases that WhatsApp and Messenger have are more different than we had thought originally.

Users get unlimited 'WhatsApp'. We get happy users who don't have to worry about data. Carriers get people willing to sign up for data plans.

WhatsApp's extremely high user engagement and rapid growth are driven by the simple, powerful and instantaneous messaging capabilities we provide.

Everybody I meet who uses 'WhatsApp', I ask them a question: 'How did you hear about it?' And they say, 'My friends, my sister or my brother, somebody I know hounded me to install WhatsApp.' We think there is more power to the network when it grows organically.

If you were in Spain or Brazil, most of the population there is interacting with WhatsApp multiple times a day.

WhatsApp only wanted to focus on how current users were engaging with the product. Like how they did not use advertising and kept the experience uncluttered.