There are some question which are related to this,. but getting the exact answer:
Lock-down iPhone/iPod/iPad so it can only run one app
Recently iOS 6 is introdu
The SureLock iOS app does nothing but inform the user how to do it in your system preferences.
Doing it from the app itself is only possible, if you break the rules about private frameworks. And break it hard.
I am sorry to tell you that the way you present your idea, would never be approved for the AppStore.