Is WhatsApp not commonly used here?

Back where I’m from, WhatsApp is the main way people text each other instead of the default messaging app. Since moving here i observed a lot of people I’m meeting don’t use it at all. They just stick to using the regular texting app.

This is a silly question but I am curious if this is just a thing with the people I’ve met so far, or is WhatsApp not that popular here for texting?