Unless they have changed, the auto-dialers won’t call any of the 00 numbers like the 1–900, 1–800, 1–600 or even the same 3 digits like 1–666, 1–888, 1–555 etc

When you schedule them to dial, you program in the area code plus the 3 digit prefix and then it dials every combination possible for that area code and prefix. The programmer chooses the first 6 digits and the system dials all the last 4 digits possible in sequence

There is legislation proposed to put a stop on these scammers and regulate the 800/877/ etc
numbers that scammers and marketers use free.

I hope they do call for-a-fee numbers, and I hope it puts the spammers out of business.