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Caller: !caller!
If you have a cell phone or a digital phone that allows you to assign ring tones to the names in your address book then you can do something about it. Maybe not the first call but repeating calls. I save the number in my address book as a DNA (do not answer) and then when it comes to ring tone for that call, I set it at "no ring"! The phone may light when they call but won't ring. About every two months I go in and delete all the DNA's except the most recent and wait for more. LOL
No one on the line when you answer and not a valid call back number. They keep calling numerous times