Not a phone conversation, but real-world conversations when you and your friends are having a regular conversation while sipping coffee together.
Yes, conversations that do not even use a smartphone that Google can record it secretly.
If you're using an Android phone, you're almost certain to enable Google Assistant features.
You just say "Ok Google" and Google Assistant will help you as a personal assistant.
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Fun is not it?
But as reported by The Sun, Google sometimes too much in listening to your voice command.
Often, even if you're not running Google Assistant, your smartphone still records your conversations for 10-20 seconds.
Once your conversation is captured by Google, it will be uploaded to their system.
This means that your conversations are never completely secret.