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.