If you want to do this so, Apple never approve this, your app must be jailbreak. you can do this by calling Private framework on your project. you can use GraphicsServices.framework. note , this GraphicsServices.framework is a private framework. Apple never accept your app. By calling GSEventLockDevice() method you can lock your Iphone Device easily. This GSEventLockDevice() resides in the GSEvent.h. hope this one helps .
