Anecdotally everything has moved to WhatsApp and the like even for voice calls. Even more interesting, there seems to be a trend to not even make calls and just go for chat most of the time!

That said, while phone calling has fallen out of favor, phone numbers are still the main form of 'identity' people have, and if anything the dominance of WhatsApp/Messenger has made it more common in my circles to share a phone number rather than a FB username.