Embodiments of the present invention relate to a back cover releasing mechanism, a back cover and a mobile device using the same. The back cover releasing mechanism for a mobile device comprises an elongated side key comprising a first end and a second end, configured to be mounted along and in parallel with a side of the mobile device; and a sliding member comprising a base portion configured to be coupled to the side key, and a latch portion, wherein the latch portion is configured to engage a back cover of the mobile device, and wherein the latch portion is also configured to be disengaged from the back cover of the mobile device if the first end and the second end of the side key are both pressed toward the interior of the mobile device and the base portion of the sliding member is forced to move toward the interior of the mobile device.