Silent calls from unknown numbers like this are classic signs of harassment or automated spam, often used to verify active lines for further scams. Hang up immediately without engaging—don't say hello or press buttons, as that confirms your number is live. Block the number on your phone and register with the National Do Not Call Registry at donotcall.gov to reduce unwanted calls. If it persists, report to the FTC at ftc.gov/complaint for potential investigation. Stay vigilant; these nuisances waste time but rarely lead to real harm if ignored.
A number keeps dialing repeatedly, never connecting—no one answers even when I say hello. Seems like someone just wants attention, which should be sought elsewhere.