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GV's block of phone numbers is probably considered low-value targets. Scammers get more value by talking to customers from big telcos. It's the whole "you don't have to outrun the bear, just your friend" kind of thing.

That's changed- I get calls all the time on my GV number. I think the initial "success" might have been due to the number blocks being previously flagged as unused. Especially when the minimum block size was still 10,000.

I'd say I get an equal number of robo-calls to my cell phone number, and my Google Voice number which forwards to it. Might have something to do with the area code.