FlashArmyKnife does a few things but what it does do is tethering rather naughtily.

To enable tethering, run the app and hit the Calculator tab at the bottom.

Punch in the following (omitting the comas): 1642, M+, C, 1452, M+, C, 1943, M+ and “run” will appear.

Tethering is now enabled (HTTP port: 6667, SOCKS port: 6668). If you need an IP address, go to the apps web tab and open a web page to create an IP address. Seems to only work on an ad hoc basis from the iPhone 5 to Mac/PC.

Be quick as Apple will pull this ASAP.