An integrated wireless module in a wireless server unit (300, 301, 304), comprising: a subassembly tray; an integrated-wireless-module input/output, I/O, connector mounted on the subassembly tray and configured to interface with the wireless server unit (300, 301, 304) through a slot; a modem controller mounted on the subassembly tray; at least one internal antenna mounted on the subassembly tray; at least two modem connectors (160) mounted on the subassembly tray and communicatively coupled to the modem controller; and at least two replaceable modems (141, 142) detachably coupled with a respective one of the at least two modem connectors; wherein the modem controller is adapted to digitally select to one of: communicatively couple at least one of the at least two modem connectors (160) to the at least one internal antenna to send and receive data via the at least one internal antenna; communicatively couple at least one of the at least two modem connectors (160) to the integrated-wireless-module I/O connector to send and receive data via the integrated-wireless-module I/O connector; and communicatively couple a first one of the at least two modem connectors (160) to the at least one internal antenna to send and receive data via the at least one internal antenna, and communicatively couple a second one of the at least two modem connectors (160) to the integrated-wireless-module I/O connector to send and receive data via the integrated-wireless-module I/O connector. a subassembly tray; an integrated-wireless-module input/output, I/O, connector mounted on the subassembly tray and configured to interface with the wireless server unit (300, 301, 304) through a slot; a modem controller mounted on the subassembly tray; at least one internal antenna mounted on the subassembly tray; at least two modem connectors (160) mounted on the subassembly tray and communicatively coupled to the modem controller; and at least two replaceable modems (141, 142) detachably coupled with a respective one of the at least two modem connectors; wherein the modem controller is adapted to digitally select to one of: communicatively couple at least one of the at least two modem connectors (160) to the at least one internal antenna to send and receive data via the at least one internal antenna; communicatively couple at least one of the at least two modem connectors (160) to the integrated-wireless-module I/O connector to send and receive data via the integrated-wireless-module I/O connector; and communicatively couple a first one of the at least two modem connectors (160) to the at least one internal antenna to send and receive data via the at least one internal antenna, and communicatively couple a second one of the at least two modem connectors (160) to the integrated-wireless-module I/O connector to send and receive data via the integrated-wireless-module I/O connector. communicatively couple at least one of the at least two modem connectors (160) to the at least one internal antenna to send and receive data via the at least one internal antenna; communicatively couple at least one of the at least two modem connectors (160) to the integrated-wireless-module I/O connector to send and receive data via the integrated-wireless-module I/O connector; and communicatively couple a first one of the at least two modem connectors (160) to the at least one internal antenna to send and receive data via the at least one internal antenna, and communicatively couple a second one of the at least two modem connectors (160) to the integrated-wireless-module I/O connector to send and receive data via the integrated-wireless-module I/O connector.