To tally these impulses, an employee visited each regional building once a month and photographed the outlets. Other employees matched the numbers in the photographs with the phone to be billed. The bills, which were calculated by hand, indicated how many impulses a subscriber had used, but not the number called or the length of the call. The same number of impulses could have originated from a minute call to Zimbabwe or an hour-long call across the street. Digital network systems allow both the connection and the billing to be done electronically.
Customers can know the exact length of the call, the number called, and the time and cost per call.
Unauthorized reproduction is strictly prohibited.