A hand held mobile telephone is disclosed comprising a front face having a longitudinal extension greater than a lateral extension and having a plurality of openings therein, and a multiplicity of keys each having an upper surface bounded by side walls. Each key 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.