Hello, I am currently working on an iOS app and studying the feasibility of a custom voice detection feature. The user might set up a secret voice keyword (a custom word or phrase). When this keyword is spoken, even when the iPhone is locked and stored in a pocket, the application would automatically trigger an action. My questions are: Can an iOS app continuously detect a custom voice keyword when running in the background and iPhone is locked? Is there an officially supported and App Store compatible method to perform this detection locally, without recording or transmitting audio? Can an application automatically trigger an action following this detection? Would using AVAudioSession and the audio mode in the background be an acceptable solution for this use case? Are there any Apple frameworks suitable for this type of feature? I would be particularly interested in feedback from Apple engineers or developers who have experimented with similar features. Thank you in advance for your help.