How to check the owner of a certain phone number?

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Here is your answer. I had the same situation. And I conducted Reverse Phone Number Lookup search. They give 100% money back guarantee if you don't get an accurate result. And one more thing, there is no free service that can bring you owner's information for free. If you are serious, consider paying a small one time fee. And they anyway give you money back guarantee, so you don't lose anything if you don't find information. But you will most probably get the information you're looking for because of their data partnership programs. Best of all, it won't even affect your relationship, since neither your girlfriend nor your suspect would be able to know that you made a personal search on some cell phone number. Reverse Phone Number Lookup Directories are professional service providers. I hope you will get your situation resolved with this. I wish you all the best.. :)