Or pull off to the side of the road, walk in well dressed, wave a dead iphone in front of them, ask the receptionist "hey my car broke down and my battery is dead, could you call this number and tell them my car broke down?" Or bonus points if the cops arrive because you're blocking traffic, ask the cop to call on their phone.
(edited I got the best idea that most anyone would fall for: Slip a kid $20 to ask an adult to call his mommie because he got lost...)