@BlueBird1827 @TwitterSupport Seems they told Ars Technica it's going to be improved at some point - https://arstechnica.com/information-technology/2019/10/twitter-used-phone-numbers-provided-for-2fa-to-match-users-to-advertisers/ Turns out, although they're tied together, it takes some time for the settings to turn back off after deleting the number. Which is why they were still "active" when I double checked