Interestingly, but last month while climbing (actually doing ferratas, if you don't know what it is check it out, very fun and friendly) in a mountain the phone fell of my pocket, easily 35 meters free fall onto the forest below.

I recovered it (by using find my, thanks Apple) and it was intact.

Two days later it fell out of my pocket while sitting in my tourism european car (short) into the concrete of the road and the glass shattered.

So yeah, the elevation doesn't seem to matter as much as the terrain it hits and the angle.