This is not for adjusting the speakerphone volume in phone calls (that has its own boost, I think), except for adjusting the volume of music, movies and apps.....!!!
Ultimate volume booster can management and boost the audio quality of your phone......!!!
This app additionally works along with your headset, headphone and speakers!!!!
EZ Volume Booster is a wonderful volume management app that controls android phone volume for all sound streams(music, voice, alarm, system). you'll simply boost your phone sound to most by only one key !!!
EZ Volume Booster is simple and easy to use application, which Boost your media sound volume with 10 - 20 % more then maximum permited! The app uses special algorithm to adjust the built-in Android equalizer, thanks to what you get stronger and clearer sound.
EZ Volume Booster provides direct access to Android Media Player in one click!
You can control Volume Boost from notification bar (Android 4.1+)
For maximum result please use a HeadSet or an external Speakers!