Volume Amplifier is a new tweatk, which increases the volume of calls by 200%.
This tweak differs from previous attempts at driving volume settings as it manipulates the audio stream, instead of trying to modify the specific configuration files.
when you install it you will have no icon or settings, only you will know that is installed by pressing the volume up and see how it grows in intensity.
This only works in tweatk iphone 5, available on the bigboss repository at the price of $ 1.99.
This is the video of their performance