Twitter has made a lot of changes under Elon Musk, many of which have been unpopular with its users. The latest one continues the trend. Starting today, non-paying users can no longer use SMS two-factor authentication. There are other ways to secure your free account, but forcing users to turn off vital security features is not a good look.

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Source: Hot Hardware – Twitter Abandons SMS 2FA For Non-Blue Users Today, How To Secure Your Account For Free