I’m too old to have had a phone as a teenager (I got my first cell the year I graduated college, and was the first in my circle to have one). Beepers were big when I was in college, and private landlines were the thing in high school.
But.
My folks got my brother and me an original Macintosh computer when I was ten. We came home from camp to find it waiting to be set up in the living room. A LOT of relatives and friends thought we were totally spoiled by that purchase, especially considering the cost (we weren’t well off, and it took them a couple of years to pay it off), but my mother insisted that this computer thing was the wave of the future, and she wanted us to get in on it.
Phones, especially smartphones, are an even stronger link to the outside world, a safety tool, and more. I know of some families whose only internet connection is their smartphones. My friend is a librarian in a poor section of L.A., and a lot of teenagers don’t even have that.
There’re iPhones and iPhones, and a teenager with an SE is vastly different from one awaiting an X. I don’t begrudge any of it, as long as they’re not raising entitled jerks.