A mobile communication terminal device comprising: one or more image sensors, configured to generate image sensor data representing an environment of the mobile communication terminal device; one or more additional sensors different from the one or more image sensors, configured to generate additional sensor data representing an environment of the mobile communication terminal device; one or more processors, configured to: receive the image sensor data from the one or more image sensors; implement at least one artificial neural network to receive the image sensor data as an artificial neural network input and output an artificial neural network output representing a detected environment parameter of the environment of the mobile communication terminal device; implement at least one additional artificial neural network to receive the additional sensor data as an additional artificial neural network input and output an additional artificial neural network output representing a detected environment parameter of the environment of the mobile communication terminal device; determine a navigation instruction based on the artificial neural network output and the additional artificial neural network output; and send a signal representing the navigation instruction to a robot terminal via a communication interface. one or more image sensors, configured to generate image sensor data representing an environment of the mobile communication terminal device; one or more additional sensors different from the one or more image sensors, configured to generate additional sensor data representing an environment of the mobile communication terminal device; one or more processors, configured to: receive the image sensor data from the one or more image sensors; implement at least one artificial neural network to receive the image sensor data as an artificial neural network input and output an artificial neural network output representing a detected environment parameter of the environment of the mobile communication terminal device; implement at least one additional artificial neural network to receive the additional sensor data as an additional artificial neural network input and output an additional artificial neural network output representing a detected environment parameter of the environment of the mobile communication terminal device; determine a navigation instruction based on the artificial neural network output and the additional artificial neural network output; and send a signal representing the navigation instruction to a robot terminal via a communication interface. receive the image sensor data from the one or more image sensors; implement at least one artificial neural network to receive the image sensor data as an artificial neural network input and output an artificial neural network output representing a detected environment parameter of the environment of the mobile communication terminal device; implement at least one additional artificial neural network to receive the additional sensor data as an additional artificial neural network input and output an additional artificial neural network output representing a detected environment parameter of the environment of the mobile communication terminal device; determine a navigation instruction based on the artificial neural network output and the additional artificial neural network output; and send a signal representing the navigation instruction to a robot terminal via a communication interface.