Hang up robo call

Called number back and it asks you to press 1 to be put on a do not call list. I heard this is a scam, do not press any numbers!!!

I just got a call from it and when I answered it hung right up. The number traces to a cellco cell phone. I am wondering if they are checking information to use in ID theft or part of that hack that took 21million peoples info? And are possibly going to do more now later?

Rang me twice and hung up before voice mail could hit it. Almost certainly another robodialer.

Called me on my cell phone while I was driving. I ignored it and let it go to voicemail. No message was left.