Every now and then an app lands on the App Store that hides a feature Apple wouldn’t be too happy about if it knew it was there. So, trust me when I say this, the app will not be on the App Store for long. But, at time of typing the app which shall not be named contains a secret feature which allows users to tether the iPhones to a computer or other device, without the carrier knowing.
Obviously, the app couldn’t get on the App Store without a genuine, legal function, so if you want you can use it to draw some random images or graffiti. Or something.
If the link doesn’t work when you hit it, or you can’t find it searching for the developer’s name, it’s more than likely been pulled by Apple. I give it 24 hours.