Abstract: A mobile device has an inertial measurement unit (IMU) that senses linear and rotational movement, a touch screen including (i) a touch-sensitive surface and (ii) a 3D sensing unit, and a state change determination module that determines state changes from a combination of (i) an output of the IMU and (ii) the 3D sensing unit sensing the hovering object. The mobile device may include a pan/zoom module. A mobile device may include a natural language processing (NLP) module that predicts a next key entry based on xy positions of keys so far touched, xy trajectory of the hovering object and NLP statistical modeling. A graphical user interface (GUI) visually highlights a predicted next key and presents a set of predicted words arranged around the current key above which the object is hovering as selectable buttons to enable entry of a complete word from the set of predicted words.