A related phenomena is caused by the BlackBerry 7100 and Pearl device's SureType technology. A full qwerty keyboard is squished down to 5 keys accross by placing two letters on each key and relying on predictive text to guess at what you mean.
My favorite example: umpire and impure both use the same keystrokes. And each time I type "umpire" the BlackBerry insists that I mean "impure."