When using the telprompt intent on iOS like
window.location = 'telprompt://' + phoneNumber
the user gets prompted to either call the number or cancel. Is there a way to know which of the two actions the user has made?
Looking at the PhoneGap docs the "startcallbutton" event is only supported on BlackBerry.
All you can do is listen for the pause event.
document.addEventListener("pause", yourCallbackFunction, false);
This event will be fired when there is an incoming call or starting a call.
or you could look into the phone listener plugin and try to write it for iOS https://github.com/devgeeks/PhoneListener
来源：https://stackoverflow.com/questions/14425348/how-to-detect-with-phonegap-on-ios-if-call-is-made-or-not