Here is a practical application that you would have thought is was already in your phone, but it is not. What's great about it is that it enables you to edit your custom dictionary. Normally you can only add, that is less frequently used "or" word is reduced. Here you can edit or delete if you want (for example, if you accidentally misspelled it). Great if you use the text input with automatic and it takes the place of the misspelled word!
* Open it with the app (without the message editor)
* Words are added by QWERTY (if the prediction is based on) appears in the T9 and can also be edited / deleted (note, you need the app to restart added words of message editors)
* (Editing language is the language on startup) to ask
* View all the words in the user dictionary
* Add new words to the dictionary on the App.
* Edit and delete existing words by some
* Check the total number of words
* Export the words in the dictionary (as an XML file)
* Import words from an XML file
* Scan Import text files to all of the words
* Bring your dictionary to another phone
To download, head over to the Beta Labs. Note that it is in the experimental phase, and then click to read more about Nokia user dictionary