How to find out the number of a prank caller?

Someone called me on my iPhone with a no caller ID and I spoke to them for about a minute and I want to know who is it, how can I do that?

Next time, ASK them. Otherwise there's no way. At least no way that does not involve getting a court order and a trace on your phone line (in case they call again). And that is not happening unless a crime was being committed or you were threatened.

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