You must not live in SF. In SF you would call a cab, and then hope that the cab would come. After 30 mins you would call again asking where the cab was, and they would send another cab. After another 30 mins you gave up and drove.

Same goes for trying to hail a cab from the streets. Empty cabs would drive past you because they wanted to only drive passengers to the airport. I'm glad they are all going out of business.