Data communication system between a wireless mobile device (10), and remote servers (30) connected to the Internet the mobile device having client applications (3), comprising a host server (20) interposed between the client applications (3) and the remote servers (30), a communication channel (4) based on a TCP tunnel and/or UDP protocol between the mobile device and the host server (20), on which are transmitted uplink and downlink data messages, the communication tunnel (4) being connected to a first data concentrator module (1) belonging to the mobile device, and to a second data concentrator module (2) belonging to the host server.