I've just got a HTC One and i really cannot figure out how you turn OFF predictive text. If i go into Settings > Language and Keyboard > HTC Sense Input > Advanced, under the heading Prediction Preference, the Word Prediction option is selected by default and is greyed out so you can't uncheck the box! Surely there must be a way around this?! I hate predictive text and i have never been able to get on with it.