Now and iOS 7 untethered jailbreak is here, you have the ability to make a lot of changes to iOS 7, for example you can get rid of skeuomorphism, but I never quite understood why they ditched the unlock sound in iOS 7. It’s especially odd when you consider that the lock sound is still there.
Just after you install the tweak on your device, go to the tweak’s settings menu where you will see a kill switch, custom unlock sound option, and custom volume level toggle and slider.
The tweak contains instructions on where to place custom sound files in order to use them with UnlockSound7. In most cases, though, it’s simply an install and go affair. There’s really no need to configure the tweak if all you’re interested in is bringing back the unlock sound.