A hand held mobile telephone (1) is disclosed comprising a front face (3) having a longitudinal extension greater than a lateral extension and having a plurality of openings therein, and a multiplicity of keys (7-13) each having an upper surface bounded by side walls. Each key (7-13) protrudes from one of the plurality of openings to provide its upper surface for tactile actuation by a user and a plurality of said multiplicity of keys are arranged along a common first axis, in the longitudinal direction. Further, at least one of said plurality of keys has a vertex, in the boundary of its upper surface, aligned on said first axis.