Configure iPhone settings programmatically

I have been developing an app where I need to configure the IPhone settings programmatically like SMS, MMS, Voice and Data. Over settings page I need to set the limits for SMS, MMS, Voice & Data, so that user cannot use it more than that.

The main thing is to set the limits for all of above; I googled a lot and didn't find any kind of help.

Is it possible to do such thing in iPhone? How can I do it by Private API or by IPhoneSDK? If it is through private API then please sugges开发者_StackOverflow中文版t me the name of that API or by the code.

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The SDK cannot do this. If this is possible, it will have to be through private API (which means you'll be limited to Cydia and jailbroken iPhones for distribution).