You just know nothing good is going to come from a conversation when you answer the phone and are immediately aware it's a robo-call because of the significant pause after you say "Hello".
If I must pick up calls (e.g. those calls coming from a place not in my contact list)... then I wait for the caller to identify themselves.
No longer believe in the normal answer phone call etiquette of saying 'hello'... or any other words - because I don't want my voice to be captured and used in some fraud way...
Never say "yes" or "no" or "agree"... for example.
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To be clear... this is for unidentified calls.
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If my contact list shows who it is - all is normal.