Volume Booster Free is the great tool to optimize your phone's volume.
Volume Booster will make your phone sound and overall volume much more stronger.
Its absolutely free to use, so go for it.
Feedback and Suggestions are most welcome to encourage more.
Note 1 : Requires Internet access permission and other relavant permissions to display ads only.
Note 2 : Not all devices support this application. Try it and see if yours works.