This caller ID said only Andover, Mass. Since I don't know anyone there, I didn't answer. They left a message. Turns out they are from the company that makes the colon cancer screening test that my doctor ordered and had sent to me. It's legit. They left a call-back number that is different from the one that called me.
Nope, not a prank call. From Exact Sciences Labs, makers of the Cologuard colon cancer screening kit ordered by doctors. They verify before sending it to you.