Accprding to the Philly Voice website: "To use ParkMobile, a motorist must enter the vehicle's license plate number, vehicle make and model and a payment method. Alternatively, people who don't have the app can call the ParkMobile Service Line and relay the same information by phone." If you call that number, it directs to either sign up for the parking app or go to a web site. If you don't have a smart phone, how can you go to the web site? I read they wrote 1600% more tickets this year than last year. What a sleezy revenue grab.