Here are some interesting things consumer can do with smartphones
Tech Star

Electronics is a branch of electrical systems that have become powerful with low-power consumption as opposed to high power consumption of electrical systems such as smartphones, they have taken more and more roles: Digital camera, MP3 player, GPS navigator, Flashlight and more. Add a third-party app store the Google Play Store to the mix, and the number of ways you can use your phone grows even further. Here are some interesting things that consumer can do with smartphones. Detection of infrared light - Our eyes cannot see it, but digital cameras can certainly. The camera of a smartphone is indeed sensitive to IR radiation, and if you want to try it yourself, simply use a common IR remote control. The infrared beam that is output when a button is pressed points as white or purple light in the viewfinder of your camera app. You can use this trick to check if the batteries of a remote are dead when it stops working.  Pair with a Bluetooth headset for an improvised remote camera shutter - Bluetooth headsets can be used as remote shutters for the camera of a smartphone. There's a catch. You should not expect this hack to work with almost any headset. What's more, you're on your own in figuring out which button or button combination makes the camera off. Connect to a USB stick or mouse - Android's on-the-go functionality allows us to connect most popular USB devices to newer Android-based smartphones and tablets. USB sticks can be connected for file transfers and a connected USB mouse can be used to navigate the user interface. You'll most likely need a USB-on-the-go cable to pull this trick, though, although some cool new USB drives come with a micro and a full-size connector. Measure distances with a camera - you might be surprised to know that this works. So roughly. Distance measurement apps cannot match the precision of a device designed for the purpose, but they should be good enough if a rough measurement is sufficient. You use trigonometry to calculate the approximate distance between the user and a visible object. To get the distance, you only have to enter the height at which you are holding the smartphone and the crosshairs at the base of the object.