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WhatsApp dominates most of the world. Yes in Asia there are a few heavily used apps. Line. WeChat etc.

Even still most in Asia also use WhatsApp.

Source: me, I've lived on all continents

India is very much a WhatsApp country. You can even access government services on WhatsApp!.

Even Antarctica?

US bases won't let you put your phone on WiFi typically, with a few exceptions I dare not name in case USAP is reading this.

It's the one I've spent the least time at. Ok, that one I didn't live on, but I did visit.

I didn't use WhatsApp there. I had to SMS / tweet with my satellite device.