PRONTO makes buying fares for MTS and NCTD easier than ever. Add money to your PRONTO app, then scan your phone at the validator each trip you make. Our pay-as-you-go function means you always get the best fare! When using the app, hold your phone 5 to 6 inches below the validator to scan your barcode. The PRONTO app can also help you plan trips, see real-time arrivals, get service statuses, save favorite stations, and find stops for San Diego County area transit so you can plan your trip aroun