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.

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).