The graphs on the left illustrate typical new user typing speeds and improvement rates on four keypad layouts:

          Delta II keypad.

          Alphabetically ordered, 26+ button keypad. (e.g. Fastap *)

         T9 * enhanced cell phone keypad.

          Standard 12-button cell phone keypad using multi-tap.

Users were timed while they typed "the quick brown fox jumps over the lazy dog", six times into each of the four different keypad simulators.

These times were converted to words-per-minute (WPM) and graphed by trials #1 - #6.

The test subjects were average typists with essentially no text-entry experience on any of the four keypad types except for S. Bogdan, who had previous experience with multi-tap.

The results presented here are typical and consistent with those of other users tested.
 

* some names above are trademarks of their respective companies.