One of the main problems in iPhone 5 (or any other iPhone for that matter) is that the speaker volume is not loud enough while talking on the phone.
hAcx Volume Amplifier fixes this problem by directly manipulating the speaker audio stream and amplifies it by up to 200%. YES! 200%.
The difference between Volume Amplifier and other Voice boosting tweaks out there on Cydia is that it does not alter a specific OS configuration file (which actually don’t work), it actually manipulates the audio stream in such way that you will really notice the difference.
The tweak doesn’t add any application or settings to the device. all you have to do is just make a phone call, click the volume “+” button on the left side of the device and continue clicking it till you see the Amplifier bar appears on the volume popup. that’s it.
If up until now you couldn’t talk on the phone while driving without going ‘nuts’ why the speaker is at such a low volume, although you raised the speaker volume all the way to the top, you got to try Volume Amplifier. you’ll be amazed at how high you can push your speaker output. which really makes you wonder why Apple limit it in the first place!
At this point the tweak only starts to work when you’re in an active phone call because the volume on other applications (such as iPod.app) is actually pretty good and can go quite high without using any tweaks.
You can always reset Volume Amplifier by assigning an Activator event inside the device Settings->General->Activator menu.
Configure options from Settings.