Okay, for you kids on the site:
A "phone booth" was a big, glass booth that used to be found on street corners in cities across the globe.  Inside, there was an old-fashioned phone that was connected to the telephone network by a series of wires and cables.  The handset was separate from the bit with the buttons.  Most places in the U.S., they cost a quarter to use.   But only for a local call.  If you wanted to make a long-distance call, you might have to put in as much as two dollars worth of change.
This prehistoric history lesson has been brought to you by Dynasty's Resident Old Fart.