https://techcrunch.com/2020/12/02/twitter-now-supports-hardware-security-keys-for-iphones-and-android/ > Twitter said Wednesday that accounts protected with a hardware security key can now log in from their iPhone or Android device. > The social media giant rolled out support for hardware security keys in 2018, allowing users to add a physical security barrier to their accounts in place of other two-factor authentication options, like a text message or a code generated from an app.