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In the US and Canada, *69 (or 1169 on a rotary phone) will redial the last number that called you, provided that you received valid Caller ID information and the caller didn't block it. If the Caller ID information was blocked, or if it got lost somewhere along the line, you can't call it back.

The phone company may have additional information about the caller, using a different system called ANI that tracks the billing number, but you need to file a formal complaint and jump through some other procedural hoops to get that information.

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13y ago

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