I am a US resident. My cell is on the Federal Do Not Call list, which makes unsolicited calls to my number illegal. I get about 5-10 spam calls a day. Phone cal

I am a US resident. My cell is on the Federal Do Not Call list, which makes unsolicited calls to my number illegal. I get about 5-10 spam calls a day. Phone calls originate from random numbers, about a third of which share the first six digits of my cell phone, by design.