The present solution is directed to establishing a group server for a group of mobile devices comprising a private mobile radio module. Each of the mobile devices of a group may have a private mobile radio module. A modular server unit detachable from and interfaced to a mobile device of the group is activated as a group server responsive to detaching the modular server unit from the mobile device. The modular server unit may include the private mobile radio which may be deactivated responsive to activating the modular server unit. The modular server unit may receive data from a plurality of mobile devices of the group of mobile devices and process the received data to consolidate the data. The modular server unit may transmit the consolidated data to each of the group's mobile devices.