Do you know Smartphone proximity sensors do work, you will not know. read here.

With the smartphone sensor, you can do many secret things you will not know about. With this help you can save the phone's battery and data.

 For this you have to download a small 22KB app in the phone. Its name is Proximity Service. 

 After installing it in the phone you can do a lot of work from the phone sensor.This app needs to be downloaded from Google Play Store. It has been rated 4.5. This app works on version 4 or above.

 Two shells are formed on top of the phone screen. The same phone has a sensor.

Step 1
 
After downloading this app (proximity service) from the Play Store, as soon as you tap on the Open. These apps become active.

 Step 2
 
Now, if you want to hear the song on YouTube, just listen to the audio and turn off the video, put the hand on the phone sensor.  

Now you will only hear audio. The screen will be off You can also keep some piece of paper on the sensor. This will save both your phone's data and more battery.

Step 3
 
Many times, after we talk over the phone, the phone's screen is pocketed without off. By which any app is open and starts running.  

This eliminates the data and battery and you do not even know. But after downloading this app, as soon as the phone is in the pocket, the phone will turn off the screen.  

Because, as soon as something comes on the sensor, the screen is off.