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by Leherenn 550 days ago
Free international messages/calls as well. That's how most of my friends and I started using it: studying abroad is pretty common in Europe with Erasmus, or even simply vacationing.

Before that, we were using Skype, but I remember WhatsApp being so much more convenient/better, especially on mobile.

If it would have been very costly to send an SMS/call a different US state, I bet WhatsApp would have taken in the US.