I work for the military and move around. My cell phone area code has not been local for years. Very useful. If the call is from the old area code and isn’t in my contact list, it is a wrong number or a telemarketer. Haven’t picked up a telemarketer call on my personal phone in ages. They still leave voice mails but anyone that knows me knows I’m not going to listen to a voice mail.
My duty phone is another matter. I have to answer it. Really aggravates me. I tell them it is a military line and they are not authorized to call it, they are breaking federal law and will be prosecuted. Total bluster but I’ve decreased telemarketer calls to about once a week instead of multiple times per day. Maybe it would work for you.
I’ll try it.