If you dont want to use handwriting either to use keyboard prediction install and select text input mode Primatech Jot after you install it. Setting/General/Text input/Input mode
I had an option for text input when i had p1i keyboard only(use only keyboard without prediction or onscreen keyboard)but in g900 that option is missing. If you select input mode none ,then you can use keyboard only for numbers.
Note: Install this only if you are not using primatech jot , this is not the original primatech jot , i edited the original installation file and removed some files

[Only registered and activated users can see links]

You need to copy this file [Only registered and activated users can see links] to c/shared to change the keymapping. I still cant fix the * button function for upper-lower case ...If some1 have that symbol please send me a msg tnx