Fastest way to look up phone numbers

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I have been focusing on pulling lists and calling the really strong leads as opposed to just sending everyone letters. I feel like letters get over-looked too easily and talking to the owner directly can have better results. The tedious part is sitting on whitepages.com for hours looking up each owner one by one. Does anyone know of a faster or easier way to look up numbers? Maybe something where I just submit the excel sheet with names and addresses and it spits them all out?