A method for monitoring medical data is disclosed, the method being applicable to a system comprising a portable medical device, a mobile communications device, and, optionally, a medical care server. The portable medical device and the mobile communications device each comprise at least one interface for data transfer. The method comprises a step of establishing a download link between the mobile communications device and a download server. The method comprises a step of selecting an appropriate communication software package from a plurality of communication software packages for controlling data transfer between the mobile communications device and the portable medical device from the download server. Further, the method comprises a download step for downloading communication software packages from the download server to the mobile communications device and a step of installation of the communication software package on the mobile communications device.