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Editorial Team
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Asked: 2026-05-25T21:01:27+00:00

Is it possible to be notified or detect when a GSM/CDMA call is taking

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Is it possible to be notified or detect when a GSM/CDMA call is taking place on an iOS handset?

I have an application that uses audio in the background and I want to be able to detect when a call is taking place so that my app can react accordingly so as not to intrude on the cellular call in anyway.

Essentially I want to be able to detect when a call is taking place so that if the user enters my application while on a call I can disable some functionality.

So I was wondering how I can detect that a cellular call is taking place on a device?

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1 Answer

  1. Editorial Team

    As of iOS 4, you can use the CTCallCenter class in the Core Telephony framework to register an event handler so your app gets notified when a call starts or ends. The CTCall it gives you has a callState property, which can be CTCallStateDialing, CTCallStateIncoming, CTCallStateConnected, or—when it ends—CTCallStateDisconnected.

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