1. A method of enabling input on a handheld electronic device having a disambiguation routine, said handheld electronic device including an input apparatus, an output apparatus, and a memory, said input apparatus having a plurality of input members that are capable of being actuated, a subset of said plurality of input members each having a first character assignment comprising a first set of letters, said method comprising: detecting a predetermined first input; responsive to said detecting a predetermined first input, displaying a representation of a keypad comprising a plurality of keys wherein at least some of the keys each have a second character assignment comprising a second set of letters, at least some of said keys each having a spatial position that corresponds to a spatial position of an input member in said subset; altering said first character assignments of at least some of said input members of said subset to each correspond with said second character assignment of a key having a corresponding spatial position, wherein the second character assignment comprises a plurality of characters; subsequent to said altering, detecting a second ambiguous input; employing said disambiguation routine to generate a linguistic interpretation of said second input; and outputting said linguistic interpretation.
7. The method according to claim 1 , further comprising detecting another predetermined input, responsive to said detecting another predetermined input, altering said first character assignments of at least some of said input members of said subset to each correspond with said first set of letters, and terminating the displaying of said representation.