I caught a cab from downtown san francisco to the mission last week, and the cab driver used square. He pulled out his phone, plugged in an adapter, ran the ca

I caught a cab from downtown san francisco to the mission last week, and the cab driver used square. He pulled out his phone, plugged in an adapter, ran the card through, I tipped, confirmed the total and signed with my finger on the touchscreen. It was the quickest card transaction I have ever had in a cab. I asked him if it was square, it was. I asked him if it was better. He pointed to the reader attached to the meter, "this charges me ten percent"; he pointed to his phone, "this charges me three". I usually pay cash for cabs, so i don't know how widespread this is, but cab drivers love talking on cellphones, and are hustling to make money. If this is a legitimate advantage, then square could clean up on the metropolitan cab market alone.