Yup, sure enough. I cancelled the land-line today.
It will save $64 a month. Looking at the bill, much of that went to fees and transfers that were completely unrelated to the cost of delivering signal to my house.
The nice gentleman who cancelled my account had difficulty finding it in the computer. Strangely, AT&T never had any difficulty with the billing software sending me bills.
Guess I will have to find something else to spend $768 a year on.