The present invention relates to communication improvements between a mobile device (12) and backend system (20) applications. A special purpose server computer—a Device Registry Server (18)—is switched between a large variety of different mobile device types (12) and a plurality of backend systems (20) for improving the communication between a mobile device and a backend system. The server (18) stores information usable for facilitating communication setup, operation and maintenance of device applications. Preferably, a ready-to-use, already customized device-type specific application can be downloaded from said server (18) to a variety of different mobile devices which is then used for easily communicate with any desired backend system (20).