Yes, sometimes, a person calling isn't too distressed to give an accurate description or knows enough to tell the difference.
Some people also do have a computer to send photos with.
But not all.
Sometimes, despite asking very detailed questions and talking people down from a phobic emotional state, you might get to the site and things aren't as they were described.
One definitely should ask detailed, questions to get the best mental picture of the situation before hopping in the truck and running out there.
Once in a while though, the little turkeys get ya anyway.