Abstract: A method and system for using a dynamically displayed bar code on a wireless device such as a cell phone or PDS, and a bar code reader to obtain a particular good and service, includes the steps of: (1) inputting a description of the good or service into the wireless device; (2) dynamically outputting a bar code corresponding to the description on the display screen of the wireless device; (3) positioning the display screen of the wireless device at a bar code reader; (4) scanning the bar code at the bar code reader; and (5) delivering the good and service in response to the scanning step. The wireless device includes location-identifying means whereby the product can be delivered to the location of the user. The system includes a database of prestored product descriptions and corresponding bar codes which is referenced by the wireless device.