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Each one of us that has a telephone has had calls from numbers we do not recognize. This can be a problem: sometimes it is a problem since you've missed a call, and you wish to understand who it was without phoning them back. Sometimes it's a problem since you don't want them to ever call back again but you can't come up with a way to make that happen. And at times it's because it is a number on your partner's phone and you want to know who they were speaking about.