Yes. X (formerly Twitter) documents two ways to enable two-factor authentication (2FA) without adding a phone number for SMS verification: an authentication app or a physical security key. The setup instructions for these methods ask you to confirm an email address if one is not already confirmed; they do not ask for a phone number. This applies to the app and key setup paths X documents, not necessarily every account, signup, or recovery situation.
Choose an authentication app or security key
X lists three 2FA methods: text message, an authentication app, and a security key. For setup without SMS, choose one of the latter two. The methods have different access needs:
| Method | What you need | Access consideration |
|---|---|---|
| Authentication app | A time-based one-time password (TOTP) app and access to the device or account where you use it. | You will need access to the authenticator to generate sign-in codes. Plan how you will retain access if you replace or lose your device. |
| Security key | A compatible physical key and a device that can connect to it. | You will need access to the key when signing in. X describes USB, Bluetooth, and NFC connections; which work depends on the key and device. |
X Help Center names Google Authenticator, Authy, Duo Mobile, and 1Password as examples of TOTP apps, not endorsements. X also says security keys can serve as the sole 2FA method, without another method enabled. Check device compatibility before choosing or buying a key.
Enable an authentication app
In X’s iOS instructions, the settings path is Settings and privacy → Security and account access → Security → Two-factor authentication. Labels may vary across app or interface versions.
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- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
- Open the Two-factor authentication settings and select Authentication app.
- Enter your password if X prompts you.
- Confirm your email address if asked. X’s documented app and key setup requires a confirmed email address if the account does not already have one; the steps do not request a phone number.
- Open your TOTP authenticator app and scan the QR code shown by X.
- Enter the code generated by the app in X to complete setup.
Set up a physical security key instead
Select Security key in the same Two-factor authentication settings and follow X’s prompts to connect the key. X describes connecting a key to a mobile device through USB, Bluetooth, or NFC, depending on the hardware and device. Complete any email confirmation prompt if your account needs it.
A security key avoids relying on an authenticator app, but it makes access to compatible hardware part of your sign-in routine. X says a key can be the sole 2FA method; that does not mean every key works with every phone or computer.
Rank #2
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Save recovery details before you need them
Save the backup code X provides during setup somewhere secure and separate from the device you use to sign in. X says backup codes can help if you lose a mobile device or change a phone number. Its troubleshooting guidance tells users who are logged out and do not have an active backup code to contact support, but does not guarantee account recovery.
X also documents temporary passwords for signing in to other devices or applications that require an X password after 2FA is enabled. The help page says users can generate one themselves and notes X may send one by SMS in some situations. Do not assume every older or third-party login flow will work without SMS.
Rank #3
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
How SMS 2FA differs
SMS is a separate 2FA choice, not a prerequisite for the authenticator-app or security-key methods. X says SMS 2FA stopped being supported for non-Premium subscribers effective March 20, 2023. For Premium subscribers, SMS availability varies by country and carrier.
Adding a phone number to an X account is also distinct from choosing SMS as a 2FA method. X lists login verification and contact discovery among reasons to associate a number with an account, but its documented app and key enrollment steps do not require one.
Quick Recap
Best Value
- The information below is per-pack only
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
Rank #4
- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Protect your account while setting up 2FA
- Before entering your password, check that you are on x.com.
- Use a unique password for X.
- Be cautious with third-party apps. X recommends OAuth instead of sharing your X password with another service.
Official X help
- How to use two-factor authentication
- Help with two-factor authentication
- About account security
- Phone number FAQs
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