I don't have a qwerty keyboard phone, but with my fat fingers I can imagine a lot more typos happening than on a regular keyboard, and since retyping is more of a chore on a mobile, I may be more inclined to just follow the links if they are remotely related to what I was searching for.
As for regular cellphone typos - you might find something link advlt, adukt, adtlt occurring, especially with words where consecutive letters fall on the same key, like t and u. It's easier to press the key +/- 1 times than to press a wrong key, I think.
I would think adult to be a good typo example, because it would be pretty easy to serve up other adult content, if that's your thing :red: , to get a high clickthru rate.