[dapearce]

I wish you could apply it to specific area codes. The area code of my phone number is not an area I have lived in for several years now. 98% of my spam calls are from this area code but none of the important unknown callers are calling from this area code.

[supertrope]

Switch to a SIP VoIP provider with a powerful control panel. Create a rule that same area code callers have to press a digit to ring through. Since spam comes from random area codes I have this applied to all non-contact list callers.

[xigency]

I tried to do this manually for a filter on the last four digits. Phones don’t really handle a 10,000 number blocklist well.