Abstract: A system utilizing a cellular mobile radiotelephone and the public switching telecommunication network (PSTN) for entering into rental agreements and for accruing and billing the resulting rental charges associated with the rental of equipment, such as automobiles. The automobiles to be rented incorporate credit-card-activated, intelligent, cellular mobile radiotelephones. Upon entry into the automobile, a customer slides a card through a card reader included therein. The card reader transfers data encoded on the card to the radiotelephone whereupon the radio telephone establishes, via the PSTN, a communications link with a processor. In response to processor-originated voice prompts that the radiotelephone conveys to the customer, the customer then uses a keypad of the radiotelephone to enter data necessary to compose the rental agreement.