My cousin homeschooled her kids, who are now finished with college. I know they're capable of using phones (one's a programmer), but I've never seen them pull one out. They're social and love playing board games, and I suspect that comes from their parents. They also socialized with other homeschooled kids, because they were part of lots of homeschooling groups.

The kids in public school are there by default; the homeschooling parents are actively choosing to raise their kids differently, and, from what I've seen, they're more likely to interact with their kids instead of letting them go terminally online or play video games.