Automated dialing systems can place thousands of calls per hour at almost no cost, which is why blocking one number does nothing the next call just comes from a different spoofed one. Most robocalls aren't trying to reach you specifically; they're testing which numbers are active and answered.
Picking up confirms your number is live and monitored, which gets it sold to more call lists. Letting unknown numbers go to voicemail is more effective than answering and hanging up.
Registering with your country's do-not-call list, enabling your carrier's built-in spam-call filtering (often free and off by default), and using your phone's silence-unknown-callers feature meaningfully reduce volume over a few weeks none of it is instant.
Replying STOP to a spam text or pressing a number to 'be removed' from a robocall list almost always confirms your number is active rather than removing it the opposite of what it claims to do.
Treat any spam call that asks for money, codes, or personal information as a scam, not just spam the vishing and spoofing precautions apply the moment it moves from an ad to a request.
The full guide includes a step-by-step spam reduction checklist.
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