Abstract: Mobile devices located across remote areas of a telecommunication network are tested using companion or auxiliary units that are coupled to the mobile devices. The units have a portable and/or compact configuration, thereby enabling easy distribution to remotely-located network subscribers, and the units each include an onboard memory subunit (e.g., a hard drive), an onboard antenna, a peripheral interface, and a controller subunit. A unit, when coupled to a mobile device (e.g., via a wired peripheral connection), determines network operations to be performed by the mobile device via a telecommunication network in order to test a compatibility of the mobile device with the network. The unit causes the mobile device to perform the network operations and obtains device system data of the device, the device system data being logged by the device during the device's performance of the network operations. The unit then provides the obtained data for analysis.