Detecting the call events in ios

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Yes you can detect a Call. but only if your app is running in the foreground.
For this you can use the Core Telephony Framework.

If your app will fall in any of the background running categories (VOIP, AUDIO, Location tracking or accessory ) you might be able to use the
CTCallCenter in the background. But be aware that Apple will reject you app if you miss use the background running mode for something it was not meant for.

The CTCallCenter will allow you to detect any calls that are started or already in progress.

However you will not be able to detect any detail about the call, the CTCall identifying the call will only tell you this state. The callID of CTCall will just give you an unique identifier for the call but not the number being called.

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