I'm in Mexico City and spent the last 6 mos in Columbia and What's App is EXCLUSIVE in the latter and completely dominant in Mexico. Nobody uses SMS.
Maybe in some parts of Europe, but not all. I'm in Norway and none of my WhatsApp contacts are Norwegian, everyone use Facebook messenger. I don't want to use WhatsApp more than I have to because of the way it tries to get access to my phone contacts and my phone number every time I want to add someone new
In South America too. In Peru, many mobile phone plans come with free data for WhatsApp, fb and Instagram which makes it way harder for people to even think of changing messaging platforms.
Argentina Brazil and France also are very Whats app dependent
France is actually a bit mixed between SMS, Whatsapp, and Facebook Messenger. My impression is that it's been shifting slowly to Whatsapp but it might be my environment.