A keymat for use with a mobile station. The keymat includes a web for interconnecting a plurality of keys, the web and the keys lying external to the mobile-station enclosure when the mobile station is fully assembled. Means for retaining the keymat provide for it to be held in place during normal operation but permitting it to be removed so that user may exchange it for another. A plurality of key pins extending from the keys through openings in the mobile-station external housing may, but are not necessarily exchangeable with the keymat.