To teach your iPhone new words, simply open up Safari on your iPhone, and type the new word into the google search field. You might have to do it a few times.

Another way is to add a secondary language to your keyboard settings, then you can ad words to your new custom dictionary setting that appears under General>Keyboard

Enjoy!

You can’t edit the word list directly, but if you create a new contact with the exact spelling of the word you want to use, it’ll work. The reason is that the spellcheck uses the word list AND the names in the contact list.

Note that when you go to create a contact you should de-capitalize the first letter (default when entering a new contact is to capitalize that letter) so it’ll come out right when you’re emailing or texting someone.

So now my contact list looks something like this:

Aaron Able
Bob Bowman
fuck
Erica Excellent
shit
Tommy Terrible

and so forth. Kind of funny to have contacts with one-word names, but what the fuck, it works for Madonna.

My real response is to the user who said the iPhone will eventually learn a certain word. This is generally true. If you ‘x’ out a suggestion enough, iPhone will generally learn what you are trying to say (My iPhone has even learned when I’m trying to spell my friends’ uncommon last names), but at least one word the iPhone absolutely will learn is hell. This is maddening. They should allow users to make ‘dictionary rules’ where you can rank words you’d generally like to have come up first. (Like, Jill could rank “Jill” ahead of “Kill” or “fuck” ahead of “duck”).

Bleh, it looks like my ultimate goal to add hell is defeated. I would say heck, but I’m sure my phone would just change it to neck =P