Patent ID: 8070500

Claim:
A mobile communications device comprising: a back cover comprising an inner surface, a sidewall, and a hatch formed in the sidewall; an ejection device fixed to the inner surface of the back cover, the ejection device comprising an resilient wall protruding from the surface of the ejection device, and an electromagnet; a groove member slidably connected to the ejection device, and aligned with the hatch, and configured for putting in a subscriber identity module (SIM) card; the groove member defining a hole; a hook device rotatably connected to the ejection device, and positioned above the electromagnet, and the hook device comprising a hook portion, wherein, when the hook device keeps in a first position, the hook portion is engaged with the hole of the groove member; a first elastic device fixed to the groove member, and configured for pushing the groove member to move; and a torsion spring fixed to the ejection device, and configured for driving the hook device to return to first position; wherein, when the electromagnet is electrified to generate a magnetic field, the magnetic field attracts the hook portion to move towards the electromagnet, thereby, the hook device becomes disengaged from the groove member, and the groove member is pushed to expose via the hatch due to an elastic force of the first elastic device.