Why do scam calls stay silent for the first 1–3 seconds?
That pause is the predictive dialer listening to tell if it reached a live human (who pauses after saying 'hello') or a voicemail/answering machine, and then holding the call until a free agent is available.
What happens if I say 'hello' more than once or ask 'is anyone there'?
Every extra word signals a live, attentive person. Scammers log that behavior, mark your number as a confirmed live lead, and may sell it to other operations.
Should I ever press a number when an automated message asks me to?
No. Pressing keys only proves a live, cooperative human is on the line and increases the chances you'll be targeted again; the 'remove me' option is typically a lie.
What is the simplest protocol to follow when an unknown number rings?
Say 'hello' once, then stay silent and count. If you hear silence for more than a second or two, hang up before three seconds. Better yet, let unknown numbers go to voicemail.
How can voicemail help reduce scam calls?
Legitimate callers (doctors, banks, family) usually leave messages. Most scam dialers either don't leave messages or only probe for answers, so sending unknown calls to voicemail makes your number less valuable.