I searched for 973-273-7897 but did by chance open a blog link for 973-273-7896
and it paid off for I tried it on last Friday and it worked to stop the phone calls here's a copy/paste; I must be (now was :) on a sucker list. I'm getting calls from 973-273-78xx (last 2 digits varies). Then I figured out how to stop the phone calls; either call 307-223-0458
or send an email to email@example.com; give the caller's phone number to verify the do not call request will be effective and your receiving phone number to remove it from the caller's list and it'll stop the phone calls.