The body is IP54-rated, so it should handle dust and splashes without a problem. And while you can buy optional covers and screen protectors, it looks like the phone will do fine without a case.

The Kompakt gets a unique hardware switch that engages Offline+ mode, for when you want to truly tune out the world. This not only disables cell networks, Wi-Fi, and Bluetooth like Airplane mode, but also the three mics and onboard camera. Plus, it physically cuts off power to the phone's GSM module, so you are all the way offline.