invention as defined by the claims and their equivalents it includes various specific details to assist in that understanding but these are to be regarded as merely exemplary accordingly those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention in addition descriptions of well known functions and constructions are omitted for clarity and conciseness the terms and words used in the following description and claims are not limited to the bibliographical meanings but are merely used by the inventor to enable a clear and consistent understanding of the invention accordingly it should be apparent to those skilled in the art that the following description of exemplary embodiments of the present invention are provided for illustration purposes only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents it is to be understood that the singular forms u201c a u201d u201c an u201d and u201c the u201d include plural referents unless the context clearly dictates otherwise thus for example reference to u201c a component surface u201d includes reference to one or more of such surfaces by the term u201c substantially u201d it is meant that the recited characteristic parameter or value need not be achieved exactly but that deviations or variations including for example tolerances measurement error measurement accuracy limitations and other factors known to those of skill in the art may occur in amounts that do not preclude the effect the characteristic was intended to provide fig2 illustrates a mobile device according to an exemplary embodiment of the present invention.