Twitter has supported 2-factor authentication (2FA) via authenticator apps for quite a while already, but it has always required you to add a phone number to your account for recovery and backup purposes. Since tie-ins with phone numbers tend to add an additional security risk thanks to SIM swap attacks, this wasn't the best solution for everyone, and Twitter has heard its safety-conscious users. It is now possible to secure your account with 2FA without adding a phone number at all.
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