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This makes sense why American Express automated prompt keeps telling me that "I can see the number you are calling from matches the number on your record" (or something like that). My first thought was how trivial it is to spoof the system. Apparently, they are more clever than I am.

In an unrelated incident, I was talking to T-Mobile when the phone got cut off. They called me back (which was amazing customer service) until the first thing he said was he needed to authenticate I was me. So I was supposed to give him the last four digits of my social. I tried to reason with him why it was a bad idea but ended up thanking him and telling him that I'd call in at a later time.