Every time I listen to the tower when a plane has landed, I hear something like this: "Delta 2431 exit at bravo then ground point four when you're clear"
What frequency is "point four" (or "point eight", etc)??? Does that mean that all airports have very similar ground frequencies?
When the approach control hands off the plane to the tower he'll tell the pilot to contact the tower and say the full frequency. So why not with the ground?