The SelectiveGO app is designed to minimize the amount of data that is transmitted both to and from your smartphone, and in normal use; the data usage is the equivalent of downloading 2-3 songs per month to your phone.
You can further reduce the data impact with a few simple settings, available under the main Settings menu, so that the app will securely store trip data on the device until it is connected to a Wi-Fi network and then upload the data over the Wi-Fi connection. Users selecting this option may see a delay in trip results appearing on the news scroll as trip results will be processed after upload.