A case for a mobile communications device is provided that is configurable to take on at least two audio/audible configurations. The first audio/audible configuration is a handset configuration and the second audio configuration is a headphone/earphone/earbud configuration. The case has a housing and a headphone male connector. The headphone male connector forms part of a headphone male connector assembly. The headphone male connector assembly is capable of moving the headphone male connector to selectively and/or mechanically engage a mobile communications device headphone port to actuate the first audio/audible configuration in a first position, and to actuate the second audio/audible configuration in a second position. A method of switching between different modes of operation of a mobile communications device, such as an iPhone™ smartphone, using the functionality of a removable, protective case for the device is also provided herein.