iOS 4.2 – Return to app after phone call

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I know the question is very old, but currently you can do this (at least on iOS 5) by using telprompt://, like:

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"telprompt://123456789"]];

iPhone will show alert view confirmation and when call ends, your app shows again, instead of iPhone’s call app.

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