The present invention provides for, in one or more embodiments, a casing system for a mobile device. The system includes an upper cover, a lower cover and a hinge mechanism providing for both axial movement and radial movement of the upper cover in relation to the lower cover. The system enables a user to have improved protection of the mobile device while also being able to better insert, remove and secure their mobile device in the present invention. The present invention provides for a unified retractable casing system which is easier to use, provides improved protection and yields a unified structure.