How do I best stay untraced making an anonymous police report with a burner phone?

So I know using a burner phone is supposed to be the least likely way to get tracked by the authorities, but when using technology you can never be 100% untraceable. If I wanted to make an anonymous report to the police and wanted to make it as untraceable as possible, how should I do that exactly?

I’ve heard that making a call while moving, like running or in a vehicle, would make it difficult for them to decipher your …

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