How to Increase SmartPhone SOUND upto 150 %

Increase SmartPhone / Android SOUND upto 200 % 

1. Go to - Dialer
2. Enter *#*#3646633*#*# or, go to Engineering Mode. Or, Play Store - https://play.google.com/store/apps/details?id=com.themonsterit.EngineerStarter
3. Then go to Hardware Testing
4. Go to Audio
5. Go to Normal , Headset , or, Loudspeaker Mode. 
6. Then change the max volume value to bigger value and SET. (Before change Note the default value)

Check the audio by playing any sound. 

Finally you got your phone's volume more than before.

Also check - How To Unlock Android Pattern, Password And Pin Lock Without Factory Reset

See the Screenshots