There are loads of Windows Phone users who wish to type on their WP device using the T9 keyboard that the good old Nokia devices had.
You can now use the traditional T9 keyboard with predictive text right on your Windows Phone device. T9-Keyboard supports four languages (English, German, French and Dutch).
The app comes with about 10,000 frequently used words for each of those languages. With the new word manager you can add and remove words until the built-in dictionary satisfies your needs. Also you can enable sound feedback and vibrate while you type.