A mobile device comprising a first casing portion, a second casing portion comprising circuitry, first and second separated pivotable hinge portions connecting the first and second casing portions to allow the first casing portion to be hingedly openable and closable with respect to the second casing portion, and a fixed hinge portion interposed between the first and second pivotable hinge portions. The fixed hinge portion is formed with a cavity in which is mounted a mating connection suitably configured such that a hardware accessory adapted to increase mobile device functionality is coupleable therewith. The hardware accessory preferably has an independent processor which is automatically recognizable and configurable by a mobile device main processor when the hardware accessory is coupled with the fixed hinge portion. The mobile device is therefore operable when the hardware accessory is not coupled therewith.