If you use the Truma App without iNet Box, all functions, such as the practical camping tools, are available offline. The instructions are downloaded once when you have a wireless connection and are stored on the mobile device.
If you use the Truma App in combination with the Truma iNet Box to control your appliances, you can use the Truma App via Bluetooth when it is within range at no additional costs. Additional costs may be incurred when you use the remote control via SMS. Ask your provider.