Hey Siri

iOS 13.4 lets your iPhone listen for Hey Siri even when faced down or covered

You know how you can temporarily prevent “Hey Siri” from listening and stop notifications on your iPhone by laying the handset with its face down, without changing any settings? This underrated feature is called Facedown Detection and it doesn't require any toggles or initial setup. iOS 13.4 adds a brand new accessibility setting designed to override Facedown Detection's automatic disabling of Hey Siri when the phone is faced down or covered.