Các tế bào connetion P5

THE BILL, PLEASE The costs of a cellular phone, of other necessities such as a battery charger, and of installation, are one-time expenses. Once you’ve paid for these items and services, you’re done with them. Fixed costs, though, account for only a part of what it costs to operate a cellular phone. In this chapter we’ll look at the other, more important expenses — what it costs you to use your phone. ONE-TIME (NONRECURRING) EXPENSES Like the price of purchasing equipment, some operating expenses are paid once and never again (unless, for example, you have your phone number taken out of service...