Foxandhound

So recently I've had a bit of a security breach and when tightening up my Evernote security I ran into a snag. I went to log in and when it asked for my Google Authenticator 2FA number I just checked that I didn't have it. It then said "send the code to your phone number" instead. Well a couple things. First off, what is the point of having Authenticator setup if you can just use your phone number anyways as well? Secondly, I noticed in my particular situation that it also said I could send it to my "back up phone number" which I didn't even recognize! My question is, how do I delete at least this back up phone number on file so that if someone breaches my password again with that phone number then they are unable to send a code to it? I can't seem to find anywhere where I can even see my phone numbers to change. I looked everywhere I think. Please help!