NOVELTY - A user replaceable cover has sidewalls defined by two lateral parts and posterior part; a face defined by the exterior surface of the upper part; an anterior edge defined at where the two lateral parts and the upper part terminate for abutment with the apparatus; a first posterior tenon extending from the interior surface of the posterior part; a second posterior tenon extending from the interior surface of the posterior part; and an anterior tenon extending from the anterior edge of the first lateral part.    USE - User replaceable cover for attachment to and detachment from an apparatus, e.g. clamshell mobile telephone.    ADVANTAGE - The user replaceable cover may be attached to an apparatus and, in particular, a flip part (4) of an apparatus without undermining the structural integrity of the flip part. The means for attaching the cover to the flip part uses projections (41) extending from the interior surface of the posterior part and the anterior edge of a lateral part. The corresponding receptacles (51, 53, 55, 57) for receiving the projections are not positioned at the lateral edges of the flip part of the cover and this maintains the strength of the flip part.    DETAILED DESCRIPTION - A user replaceable cover comprises:    (A) a first lateral part extending in a first direction, a second lateral part disposed opposite the first lateral part and extending in the first direction, a posterior part extending in a second direction orthogonal to the first direction and joining the two lateral parts and an upper part having extremities and joining at the extremities the two lateral parts and the posterior part, where each of the first lateral part, the second lateral part, the posterior part and the upper part has an interior surface and an exterior surface;    (B) sidewalls defined by the two lateral parts and the posterior part, where the sidewalls terminate at a lower edge for abutment with the apparatus (2);    (C) a face defined by the exterior surface of the upper part;    (D) an anterior edge defined at where the first lateral part, the second lateral part and the upper part terminate for abutment with the apparatus;    (E) a first posterior tenon extending from the interior surface of the posterior part;    (F) a second posterior tenon extending from the interior surface of the posterior part; and    (G) an anterior tenon extending from the anterior edge of the first lateral part.    DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of the apparatus with a cover removed.    Flip part (4)    Display (40)    Projection (41)    Lower portion (46)    Receptacles (51, 53, 55, 57)