Pocket dialed...so that’s what they call it these days
Most people I know call it 'butt-dialing'.
My phone does it. It’s locked. UNLESS the keys or something else hits 9 or # ... it has dialed 911 3 times in the year I have had it. And a few friends. I often keep it in my back-pocket anymore while I’m walking somewhere. Unless it’s winter and I can put it in my leather jacket.
If it hits that 9, it’s off to the races if something is pressing on the 1. Argh.
I like a real keyboard (it’s not the best one) but it’s cheap.