I want to get information about blocked and dropped calls. When you call someone through your phone, sometimes your call get blocked or dropped, then you hear a message, "Please try again". I want to access that information in my app. Is it possible in iPhone? Maybe for jailbroken devices?
Information about blocked calls in iPhone
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The decision to play a "please try again" recording is (generally) made by a device called a Service Control Point in the telephone network. From the phone's perspective, a "please try again" recording looks the same as a successfully completed call: The network doesn't tell your phone that it routed the call to secondary treatment, so there's no data stored on the phone that you could collect or analyze.
When your iPhone displays a "Call Failed" message and a "Try Again" button, the point of failure is closer to you – usually it means your phone lost contact with the cellular base station – and the phone does log that the call didn't go through. Apparently it's possible to access the iPhone's call history database without using private APIs, so in theory you could use this in your app (if Apple approves).