User replaceable cover for hand held electronic device

The invention relates to a user attachable/detachable replacement external non-planar cover (14) for replacing a user detachable external non-planar cover (14) of a hand held communications device and thereby modifying the external appearance of the hand held communications device, comprising: a main face, having an upper surface which is exposed when the cover (14) is attached to the hand held device; and a side wall joining the main face at its edge and extending downwards, away from the upper surface of the main face whereby the main face and at least portions of the side wall define a cavity for receiving portions of the hand held communications device, the main face having a plurality of openings (7') through to the cavity, wherein the downwardly extending side wall provides at least one element (12') for forming, without the use of a tool, a user releasable attachment to a hand held communications device (1) having had its user detachable cover (14) previously removed.