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What is most cost effective way to purchase all residential phone numbers in SF, LA and NYC? Is there a startup working on this?

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Karan Singal, Vice President at ConnectAndSell, Inc. answered:

The legacy solution is InfoUSA. Not sure how good their data is anymore, but used to be solid a few years ago. Mellisa Data, relevategroup and a few others do this. Do a search for "Data Append" on google and scroll through the first few results. I'll have to dig it up but I think there are about 5 big ones in this space. Cost anything between 1-15 cents a pop.

I would imagine Trucaller is heading in that direction.

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