: Instead of 26 tiny keys, he only had 9 large ones. His error rate plummeted.

If you want, I can:

It read: "T H A N K S."

T9, developed by Tegic Communications in the mid-90s, solved this with a linguistic algorithm. Instead of requiring multiple taps to cycle through letters, T9 mapped every letter on a key to a single press. You want "HELLO"? You simply pressed 4-3-5-5-6.