T9 Nokia layout: Can you teach me how to make a

[London]

Dear Cyril,

In my mind, the best phones for writing texts are still standard T9 Nokia keyboards. They are minimal, but the features of the buttons make everything you need in day-to-day texting is available.

If I map the functions of the keys, is there any chance you can explain what I could do in order for this to be a implementable option?