A mobile communication terminal device is disclosed having elements for detecting moisture in the device. These elements include the following precautionary features: a memory for recording a circumstance under which the detection of moisture takes place, a shutdown feature for shutting down the mobile communication terminal device at least partially if moisture has been detected, and a feature for determining two circumstances, namely that the mobile communications terminal has been at least partially shut down as a result of a detection of moisture and that the mobile communication terminal device has been connected to an external power supply and subsequent current is being drawn from the power supply. Once these two circumstances have been detected, a mode is activated by which the mobile communication terminal device is subjected to a heating phase and as a result, in turn, to a drying phase.