iPhone: is it possible to enable/disable phone features programmatically?

I want to lock / unlock some features of iPhone such as send/receive text message开发者_开发百科, make the phone silent for incoming call etc while using my application.

Is it possible? If possible, How?

There is not an Apple-approved way of controlling this. However, you can "prevent" your phone from locking when your app is running. [UIApplication sharedApplication].idleTimerDisabled = YES should do it.