Your missing the point. Spammers call you from a spoofed number so that you think its someone near you based on the area code. I lived just a town over an invisible line in 2009, and ordered a new phone, and got an area code that the only other person I know that has a number in that area code is my wife. (920)

the ONLY calls that call me from that area code are spammers. if I get calls from any other area code, only 20% or so are spammers. Others are sales/marketing for IT companies, etc, and calls from one of the 2 area codes that cover my area where I actually live are usually all local businesses, etc. If I had to guess, I would say 85-90% of the 'spam callers' call and spoof the 920 area code when they dial me. that drastically cuts down on my automated messages about a car warranty that is about to expire.

You misunderstand slightly. All the calls from the area code matching your phone number are more likely to be spam (spammers matching you to appear legit). So unless you call people in that particular area, you won't be matching their area code, so you won't look like a spammer. And unless you happen to know a lot of people in that area, you won't get calls from that area that appear to be spam.

> But then my calls will come from the random area code too

Nobody will care. Everybody's cell number is just a record of where they lived when they got their first phone; people you call will have you in their contact list most likely.