So I got a letter today, that with iOS11 or macOs High Sierra everyone is going to be forced to use two-factor authentication. Here is my concern with this. I have iTunes account that I only use for App Store for iOS and macOS. It is currently configured for two-step verification (text message). How the heck am I supposed to use this account with two-factor authentication when I do not have a single device connected with it since the account is only used for App Store purchases across 10+ devices. Does anyone have a solution to this or am I over thinking this?