Face Tracking
Using the camera of the smart phones, the processors now have the capacity to capture faces and translate their emotions. Machine learning ensures the accuracy becomes greater and greater as a library is built through use.
Gesture Recognition
By forming a recognisable shape with your hand, menus can be navigated by using the same technology as face recognition. The features of you hand and movement of your fingers can be tracked to determine the position and state of your "browsing tool".
Voice Commands
As microphones and processors become better, the accuracy of voice command recognition has increased and is now being embedded to several smartphones. Using your voice to access functions on the phone doesn't require any physical movement, which can be an advantage in situations when both hands are needed.
Virtual 3D Sound
We only have two ears and there is no need for 5 speakers in order to get a sense of virtual 3d sound. Binaural recording can be used to create a library of positional cues, where the number of files determine the resolution of the cues.
RFID
Radio Frequency Identification tags are used to identify items using a scanner from up to 6 meters away. They haven't yet been embraced by corporations as they are still too expensive to be beneficial to products of all price ranges. However, if direcional RFID-receivers become part of smartphones, the benefits are immense, for example in indoor navigation.
QR Codes
Quick response codes have the advantage of being read quickly by a camera from a longer distance than barcodes. Putting these on products would allow more rapid reading of such codes as well as the possibility of more embedded information.
GPS
The Global Positioning System can be used to determine the position of the user with an accuracy up to less than 5 meters. Assisted GPS in new smartphones improves the speed and accuracy further. The new European Galileo project would provide an even more accurate service, which could, if permission is granted, be used for Blinput applications to a large benefit for visually impaired users.
Sensors
The magnetometer and accelerometer inside the smartphone would be used to determine the angle and movement of the phone. Applications include navigation, phone activation and games.