Yeah, it basically kicks you out of whatever app you're in. Now, you can navigate back to apps once you're in the phone call, which could potentially cause a pr

Yeah, it basically kicks you out of whatever app you're in. Now, you can navigate back to apps once you're in the phone call, which could potentially cause a problem if both the phone app and the camera app are vying for the same control over the volume buttons, but Apple could just make it so the phone app always has priority over those buttons.