IPhone system settings?

Hello all - I am new to iPhone development and objective-C.
Does anyone know if the latest SDK supports reading of system constants? e.g. Can my app detect if the phone is in airplane mode, wi-fi is enabled, or what the screen brightness is currently set at etc.? And to take it a step further, is there anyway in code to toggle these settings? Does sandbox mode prevent any of this? I cannot find any examples in the provided documentation.
Thanks.

The answer is basically, "no" to reading system configs and definitely "no" to changing them. Apple's goal is to make the iPhone OS the most secure mobile OS in existence. There are very harsh constraints necessary to accommodate this. Now to my qualifier on the first, "no". If you look at the "Reachability" example application it'll show you how you can check to see if you can access some node via:
1-- the cell data network (whatever the phone uses--Edge or 3G)
2-- via a regular WiFi connetion
3-- via an ad-hoc bonjour-style computer-to-computer WiFi network connection
This may or may not be enough to get you what you need. Doing more than this will probably requires... uh... other license-breaking techniques.

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