The hot spot is equipped with a mini-SIM card. After charging it is turned on with some button and is ready for use. The settings you take before using (Android) App. There the SIM input can be disabled or power saving modes can be set. Also on the SIM card Incoming SMS can be read. The symbols on the Hotspot indicate the most important information (Netzemfang, WiFi, battery level and SMS inbox).
Unfortunately, it is quite warm and is great in the winter as a hand warmer!