The Waltti Card Reader app can be downloaded free of charge from Google Play. The application works on phones and tablets that are NFC-capable and on Android OS devices. If you touch a Waltti card with an NFC-capable phone, the Waltti Card Reader app will display valid season tickets, remaining value, the most recent value ticket and previous journeys made using the travel card. The app can also be used to e-mail yourself receipt information for the most recently purchased value ticket. The application only reads Waltti travel cards and day tickets.

Of course, you can also check the balance on your travel card using the card reader device on buses, at service or sales points, or at self-service ticket machines.