How the Romi Taxi app works is really simple:
1. Set your pickup location (Eg: your current location)
2. Pick the cab you want
3. Tap "Ride now" to book your ride
4. Get instant confirmation with driver details
5. See your ride and route on the map
6. Pay only after completion of your ride.

You want to schedule a pickup for sometime later? Just use "Ride later".