I’d never heard of STIR/SHAKEN…but after looking into it, supposedly T-Mobile was one of the first mobile carriers to implement it…and I’m on T-Mobile…but for the past several years, I keep getting unwanted spam calls to my cell phone that appears to be originating from very regional local numbers (area codes and number prefixes that are local to my area)…because of that I just assumed that they had to be spoofed since the calls are always an unwanted telemarketing robo call and never involve an actual business that is local to me.

So I don’t know how they are still doing it, but somehow telemarketers are causing calls to route through exchanges that are completely local to me.