A communication apparatus for subsequent installation in a vehicle and/or for mobile use, having: a transceiver having an antenna for wireless data transmission, a GNSS receiver having an antenna for receiving signals from a global satellite navigation system, an inertial measurement unit, and a housing enclosing the transceiver, the GNSS receiver and the inertial measurement unit at least in part. The communication apparatus is configured to use data captured by the inertial measurement unit and/or the GNSS receiver to perform motion detection, in order to ascertain a motion pattern, and to perform or prevent a data transmission by the antenna for the purpose of wireless data transmission as a function of the ascertained motion pattern. Furthermore, the a method for execution using such a communication apparatus is disclosed.