Spot on, I have a cell phone that uses a different area code from the city I live in (it's actually Vegas, a city I've never lived in). Between Google Voice, and knowing that any local number is a wrong number, I don't ever have to deal with spam calls.

* How To Duck Cell Phone Taxes || https://www.forbes.com/2005/06/06/cz_sw_0606cellphone.html#2... (Not sure if this is still relevant, haven't looked at my cell phone bill in years... but never switched to a local area code since I liked the filtration side effect.)