I could do it while driving. It was much easier to do than you would imagine. The keypad only had 9 keys and if you would put the base of your thumb lightly on

I could do it while driving. It was much easier to do than you would imagine. The keypad only had 9 keys and if you would put the base of your thumb lightly on the 2 key you could reach the whole keypad without issue. Just about everyone learned to do this without trying. People who had predictive text like T9 had to work at it a little, but it was like riding a bicycle.