Red bar? Maybe you're thinking of another device or app? The way I understand it, an iOS device does always listen for "Siri", but that's done in isolated hard

Red bar? Maybe you're thinking of another device or app? The way I understand it, an iOS device does always listen for "Siri", but that's done in isolated hardware that an app has no access to. The orange "microphone" dot does show when it hears your "Siri" command, as well as when an app with microphone permission is listening. (Checked on an iPhone 13, iOS 18).