Mobile communications devices having moveable housings are described. In an implementation, a mobile communications device includes a first housing and a second housing. At least one of the first or second housings are moveable between a first configuration in which the first housing substantially covers the second housing so that an outer surface of the second housing is covered and an outer surface of the first housing is viewable, and a second configuration in which said outer surface of the second housing is exposed and positioned such that said outer surface of the second housing is positioned in a substantially similar plane to that of said outer surface of the first housing.

Embodiments of this application provide a foldable electronic device, including: a shaft cap, a body, a first cam component, and a second cam component. The first cam component and the second cam component come into pressure contact. The first cam component is configured to be rotatable around a central shaft of the first cam component. The second cam component is configured to be slidable along a direction of the central shaft. A contact surface of the first cam component and the second cam component includes a locking section, an angle between a normal direction of the locking section and the central shaft is less than or equal to a preset value, and a resultant force of a cam driving member in a rotation direction of the cam driving member is o, so that the body is not automatically unfolded or folded, thereby implementing the freestop characteristic.