14. A computer-implemented method for receiving text-input on a touch-sensitive display device, comprising: presenting a primary key plane of a virtual keyboard on the touch-sensitive display device, the primary key plane including a set of initial phonetic symbols of a phonetic alphabet and none of a set of final phonetic symbols of the phonetic alphabet; receiving a first user input selecting one of the set of initial phonetic symbols on the primary key plane; and upon receiving the first user input, presenting an alternate, secondary key plane of the virtual keyboard in place of the primary key plane on the touch-sensitive display device, the secondary key plane including a set of final phonetic symbols of the phonetic alphabet and none of the set of initial phonetic symbols of the phonetic alphabet.
14. A computer-implemented method for receiving text-input on a touch-sensitive display device, comprising: presenting a primary key plane of a virtual keyboard on the touch-sensitive display device, the primary key plane including a set of initial phonetic symbols of a phonetic alphabet and none of a set of final phonetic symbols of the phonetic alphabet; receiving a first user input selecting one of the set of initial phonetic symbols on the primary key plane; and upon receiving the first user input, presenting an alternate, secondary key plane of the virtual keyboard in place of the primary key plane on the touch-sensitive display device, the secondary key plane including a set of final phonetic symbols of the phonetic alphabet and none of the set of initial phonetic symbols of the phonetic alphabet. 20. The method of claim 14 , wherein the phonetic symbols are Zhuyin symbols of a Chinese Zhuyin alphabet and are arranged in horizontal rows on the primary and the secondary key planes in predetermined phonetic groups of the Chinese Zhuyin alphabet.