The present invention relates to a mobile communication device for communicating with a cellular network by means of a serving base node, the mobile communication device further being connected to a subscriber identity module, the mobile communication device being configured to operate in a power optimization mode and to set up a communication context with the base node using authentication means of the subscriber identity module, wherein the mobile communication device is further configured, in case of detection of a removal of the subscriber identity module and when the power optimization mode is activated: - to send an removal alert message to the serving base node by means of said communication context, - afterwards to terminate the communication context.