28. The method of claim 27 , wherein both the first and the second key planes include a set of medial phonetic symbols of the phonetic alphabet.
28. The method of claim 27 , wherein both the first and the second key planes include a set of medial phonetic symbols of the phonetic alphabet. 29. The method of claim 28 , further comprising: while the first key plane is being presented, receiving user input adding an initial phonetic symbol or a medial symbol to a symbol input sequence; and upon receiving the user input, presenting the second key plane of the virtual keyboard in place of the first key plane.