Increase your Android phone’s volume without any app just follow these simple steps
Goto your phone dialer
*#*#3646633#*#*
And you will enter engineer mode
Click audio
You will see Max Vol ,input a value between the range mentioned
This is working only for selected handsets
How can I dial these codes in Nexus 7 2013 ?
Not working
Device: Xperia Ion LT28h