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Do our phones listen to our conversations? The answer is complicated.
(english.elpais.com)
This is a most excellent place for technology news and articles.
Dude my phone will ever now then turn on and say "I didn't understand you" meaning something or someone turned on the mic to listen.
That happens when it mis-hears a trigger word. You can enable and audible 'ping' noise to play when you activate Google Assistant. It's in the accessibility settings. Worth doing so you know when it's actually been triggered.