This could be really helpful in future iterations, assuming advances in smartphones. For example, if your phone had infrared or image intensifying tech then you could read things like signs or numbers in the dark or poor light. In its present version, you need both good light and a still hand.
Surely James Bond has one of these lying around somewhere, right? British DC'ers, help us out on this one; make a call to MI5 or Major Boothroyd if you know the number!