"Arby’s used to have a “take a survey on the back of the receipt and get a free roast beef sandwich”. But when I got the free one, I got a receipt then too. I bought one sandwich got literally dozens for free over the course of a year or so."
MermaidRumspringa
Most of the time, the operator knew the number was a pay phone. After ~5 tries, we would get an operator who didn’t know or check that it was a pay phone.