engineereeyore wrote:What you want to do is create a profile for you iPhone. In that profile, you can manage the restrictions on your device, which include access to safari, youtube, etc. I don't think you can turn off wifi and 3G with restrictions, but I know you can restrict access to applications. In the profile, you should also be able to specify at what times of the day the profile is enforced. Google iphone profiles and you should see a few tools that can help you create profiles. This should not require you to jailbreak the device. Profiles are commonly used in enterprise and educational applications.
This. You can have a trusted friend set a password that must be entered to allow the profile to be removed.