I have picked up many a hitchhiker back in the day. Been picked up alot too. But that was different times. Nobody ever thinks they can get socially engineered. Ever. And yet, many do. Often because they have stuff on their mind that keeps them from thinking clearly. I have known some seriously intelligent people that clicked on the wrong SPAM and broke their computer.
Still wondering what kind of "emergency" requires a phone call with me making a decision in ten seconds? Obviously, a car accident is one. In which case I would call the police. I am from NYC. And believe me, there were many scammers around and this was 30 years before the Interwebs. Many. 3 Card Monty anyone?
I've had people ask me for money at the airport to buy a ticket home with some sad story that they've run out of cash in the big city. Everybody knows that a same-day ticket at the airport costs like $2500, and really if you're trying to get from A to B using the least amount of money possible you should take the bus. So really they're only trying to get some cash.
But this crap works with at least some people, that's why they keep doing it, and why some people would fall for this "lend me your phone" thing.