That's a good point. They are not particularly uncooperative. They are just hard to reach.
And even if you have their cell phone number, a lot of times you can't keep a call going for more than a couple of minutes. I tried one time to make a cell call coming down I-70 into Denver. Got cut off four times in five miles - the moutains create a lot of dead zones. I live a little over a mile from I-70 west of Denver, and couldn't make a cell call unless I went to the bottom of my driveway.