Disclosed is an advertising method using a public telephone and a system for providing free or discounted call service according to watching of an advertisement. The present invention provides methods for determining the concentration of physiologically acceptable excipients for use in the formulations of the invention. Such data include EPG data, data broadcast data, print contents data and supplementary information on the print contents data. The suction filtration unit is, for example, a negative pressure tube provided at an opening with a rubber stopper. Moreover, a second ball knob assembly is mechanically coupled to the slider extension tube for supporting the tray.