Disabling text (SMS) and walk application
Text and walking can be dangerous, you can miss hole in the ground or hit a car (a full article can be found here http://www.couriermail.com.au/news/tech-absorbed-pedestrians-risking-dea... )
There are some application that disables text and driving, and they do it by checking your speed (probably by the internal phone GPS). if the speed is more the 10 mph, they disable the phone. We should have a similar application for lower velocities of walking.