When call ends open application to show details about call duration - iphone

I am new in iPhone application development. Now I am developing a call history application. I want my application to run in background and when the call is finished the application show call details. I don't know how to develop this. Please help me any one know.
Thanks in advance

Sorry, but there is no way to do what you want using the iOS SDK. The user's call history is private.

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I'm trying to develop an app that prevents a user from starting other application when my app is running. The scenario:
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Any ideas would help.
Thank you.
There is a few ways to do that but easy one to observe your app situation, you can use WidgetsBindingObserver to detect your app is background or not.
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Currently, I am working on one security application. In this application, user can select applications for which he/she want to have additional security.
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in iOS, Application run in its own sandbox environment. You cannot control other application's startup and hence this is not feasible using any apple documented APIs.
this is not possible.In iOS, Application run in its own sandbox environment so you cannot get any application information. this is only done in jailbreak programming. In witch you hook app startup method method and show your popup first.

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-GVG
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http://gilesvangruisen.com/
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http://mattgemmell.com/2008/02/22/mgtwitterengine-twitter-from-cocoa
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