This is the same thing for me. Short version is that I'm from Detroit area, lived in NH for a while, and now reside in Tampa area. My cellphone has a 603 area

This is the same thing for me. Short version is that I'm from Detroit area, lived in NH for a while, and now reside in Tampa area. My cellphone has a 603 area code (NH). But since I'm not from there, the only 603 numbers I care about are already in my address book, any others are guaranteed to be spam calls. This lets me easily ignore 95% of them (I also occasionally see an 802 (VT) number or a 978 (MA) number). What is interesting is that I have started to receive more 727 (local area code) spam calls, maybe 2-3 per month. I suspect this must be from local friends and contacts leaking my number through sharing address books with various apps. I am at the point now where incoming phone calls are near valueless, other than from a very small set of numbers. Most people text me, or contact me through other apps/methods. Even for business purposes, incoming calls are almost always scheduled and the very very few that are not, and from an unrecognized number, can leave a voicemail. It is somewhat amazing how the telco's have let their core product, voice calls, become nearly worthless by not handling these spam call problems. Now I'm using contact methods and apps that are not provided by telcos and not strictly reliant on their networks.