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Re:Robocalls Flooding Your Cellphone? Here’s How to Stop Them by SippinLean on Wednesday August 16, 2017 @10:30AM (#15027720)
A piece of advice they don't mention: use an alternate number for registering websites and/or hide your WHOIS data.

I have a Google Voice # I used only for domain registration. I let the WHOIS guard expire, and I now get regular spam calls to that number daily.

I'm sure they source the numbers from a lot of places, but from what I've experienced and read this is a big source of them.

Re:Robocalls Flooding Your Cellphone? Here’s How to Stop Them by scierama on Wednesday August 16, 2017 @10:49AM (#15027869)
I use Google Domains, privacy guarding is free.