Do not use a SIM card adapter. Because of the different material thicknesses of the different adapters, you may be able to insert the adapter

No, nano cards do not fit into the tray. In this case, order a new SIM card from your provider. Do not use a SIM

No, unfortunately that is not possible.

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