Abstract: A detection and communication system for mobile devices, the system comprising at least two mobile devices (D1, D2) of the mobile telephone, tablet, connected smartwatch, or similar type, each mobile device being fitted with long-range communication means of the Wi-Fi type and with short-range communication means of the Bluetooth® type, said system including an identification platform enabling users to identify their mobile devices, said system being characterized in that it detects all mobile devices identified on said identification platform and that come within the fields of said long-range and/or short-range communication means, and in that, in the absence of a telephone communication network, in particular of the 2G, 3G, 4G, 5G, UMTS, GPRS, or EDGE type, said long-range communication means push the signals of said short-range communication means so that two identified mobile devices within the fields of said long-range communication means can communicate via their short-range communication means, even be