it does learn. it just doesn't learn it the first time you type in a word. there was a way to add words as well with one of the developer tools. i don't think you can any longer though, been a while since i've looked at the developer tools. you can clear out the custom dictionary by going to settings>general>reset>reset keyboard dictionary
the dictionary is used across all apps that use the keyboard.
from the iOS 4 user's guide (page 168) "You add words to the keyboard dictionary by rejecting words iPhone suggests as you type. Tap a word to reject the correction and add the word to the keyboard dictionary."
personally i've found the auto-correct useful, but i guess it depends on your use and what it's correcting. i believe it will not correct any word that starts with a capital letter (thinking it is a proper noun) or number. it will auto-correct some common mistakes like hte -> the but other words need to be tapped or picked out of a list. auto-correct behavior is a little different from 3.x to 4.x as well.
Last edited by scottjl; 07-28-2010 at 07:05 PM.
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