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Reverse phone look up is the service used to Find Out Who Called Youfrom an unknown number. The service is legal as they have agreements with the private telephone number owners and also public record databases. Since they provide you with the information which is not publicly available this is why they can charge for it. We can use this service for lawful reasons like security. Many a times it happens that you have a number written somewhere but the name is missing. In that case too the service can be used. The information must not be used for telemarketing.