Easily less than 10% of my time spent using a phone today involves making phone calls, and I think that's far from an outlier.
You'll cause mild panic in a sizable share of people under 30 if you call them without a warning text.
On the flip side, I cause a medium panic in my daughter when I text "please call me when you can" without a why attached. She assumes someone's in the hospital or dying or something.
That’s a pretty far cry from “nobody makes phone calls”. You can also find people who spend 6+ hours on phone calls everyday, including people under 30.