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This I think was poorly communicated. I found it out by accident, prior to that it seemed like Siri had taken a nosedive. "Hey Siri...." waiting.... followed by the cancel tone or sometimes "Yes?" - then the cancelled tone.

I might try 'Hey Siri' again now that I'm on iphone X. I'm not particularly a fan of always on mic's and the experience in the past was never sufficient for me.

(side benefit -- as a result of this conversation I have discovered that its possible to turn off the 'activate siri via side button' mis-feature -- HURRAY! I can count on one hand the number of times where I invoked siri this way on purpose and on 100 hands the times its happened on accident. [Yes that does mean I almost never intentionally invoke siri])

This isn't true. On iPhone 6, running the latest iOS version, with a brand new battery, there is a significant delay before you can speak. Instead, you have to hold the home button down.

https://david-smith.org/iosversionstats/

Hey Siri doesn't work on the iPhone 6 if it's not plugged in. Only the 6s and later do, and it's enabled by a specific low power chip.