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You answer, and the line goes silent for a few seconds.

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Ofcom says most silent calls come from automated diallers in call centres.

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What matters is what happens next: a recorded message, or a person asking for money or details.

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The Federal Trade Commission's advice: hang up, and don't press any numbers.

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Caller ID can be faked, so call back only on a number you already know.

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Here is one free check that helps: set up call screening with the phone checklist at UtilForge.org.

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Do it side by side with someone you love, and print it.

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Share this with someone who still answers every call.