Q12 vs. multiple taps

Q12 requires just one press to enter any symbol. Q12 does not require waiting and reduces mistypings ratio.

Q12 vs. predicative methods

Q12 allows inputting any text - proper names, abbreviations and URLs - no matter if there is such text in dictionary.

Q12 vs. other keypad designs

Q12 practically does not modify the traditional keypad. With Q12 its primary function - dialing phone numbers - works the same way as usual - there are digits on buttons, with buttons in their places. With no extra buttons Q12 adds complete alphabet with a familiar layout that does not require any learning.