9. The keypad of claim 8 , wherein the plurality of alphabetic letters assigned to the one key of the at least one key are displayed on a surface of the one key in an order associated with frequency of use of each of said plurality of alphabetic letters.
10. The keypad of claim 9 , wherein the plurality of alphabetic letters are displayed on the surface of the one key of the at least one key in a descending order with respect to highest frequency of use.