1. A wireless handheld communication device comprising: a housing containing a display screen located above a physical keyboard; said keyboard comprising: a plurality of physical keys and corresponding indicia, said plurality of physical keys including physical keys associated with alphabetic characters corresponding to a QWERTY array of letters A-Z and physical keys associated with numeric characters 0-9 corresponding to a telephone keypad arrangement, said physical keys associated with numeric characters being partially overlaid on said physical keys associated with alphabetic characters; and a microprocessor that configures said device between at least three device operating modes including a telephony mode, an email mode and at least one additional mode, and wherein, when operating in at least one of said additional modes, said microprocessor displays a key-function map on said display screen indicative of enabled functions associated with particular physical keys of the keyboard which are at least partially different from the functions signified by the indicia associated with the particular physical keys.