Got a great Cydia tweak forwarded from our friend @iphoneman76, called Volume Boost.
This tweaks works just as it’s described.
To install, simply head over to Cydia and search for ‘Volume Boost’, of course you have to jailbreak your device first.
If you are reading this from your device just click this Volume Boost iPhone link.
After installing this free Cydia application, reboot your device and you will see a big 30% increase to the overall volume.
Now this tweaks has been out before but we did lose compatibility throughout ios 5.1.1 and iOS 6, the new version has been updated to provide support for both iOS 5.1.1 and iOS 6.