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When it comes to my phone, I'm very careful as well. But since you're expected to carry it around all the time -- through many bumps and travails -- all kinds of things can happen to it. It's there, then it isn't because you've forgotten it somewhere.
One day in the winter I had gone somewhere and returned to the place we were staying. And a couple hours later I went to check my phone and it wasn't there. So I retraced my steps, which led to the car, and guess what -- the phone was lying in the middle of the street! It was a cul-de-sac and has little traffic, and there was a car right across from my car, so any car that happened through there would've had to straddle my phone. It was winter, as I said, and cold, so for a while that day my phone was very sluggish. But it recovered.
Then the other day I went to get a pizza. I called the pizza place a few minutes before I got there to order. And I thought I put the phone on the seat, but maybe I put it on my lap. Just before I got there it took off with a huge downpour, raining. So when I got to the pizza place, I jumped out of the car and went running in. I'm standing in there and felt down for my phone and it wasn't there, so I thought it was on the car seat. When I got the pizza, 10 minutes or so later, I went running back to the car in the torrential rain, and there was my phone, lying in a puddle, getting soaked to the bone.
I picked it up of course, but it never worked from that point on. I dried it out, took it apart, etc., but nothing could bring it back from the dead. So I had to go get a new one.
They're so hard to keep track of entirely. It's a regular job to keep a cell phone from getting lost or destroyed.