How do I use text messages (SMS) for two-factor authentication on Instagram?
When you turn on two-factor authentication, you're asked to choose either text message (SMS) codes or a third-party authentication app as your primary security method. If you choose to use text message (SMS), you'll be sent a text message (SMS) with a special 6-digit security code each time someone tries logging into your Instagram account from a device we don't recognize.
To turn on text message (SMS) login codes for your mobile phone:
  1. Tap instagram-user-profile or your profile picture in the bottom right to go to your profile.
  2. Tap three lines stacked on top of each other in the top right, then tap a symbol circle gearSettings.
  3. Tap Security, then tap Two-Factor Authentication.
  4. Tap Get Started.
  5. Tap toggle next to Text Message.
  6. If your account doesn't have a confirmed phone number, you'll be asked to enter one. After entering the phone number, tap Next.
  7. Tap Done.
Keep in mind that you must have a confirmed telephone number for your Instagram account to use text messages (SMS) two-factor authentication. When you enter a telephone number to turn on two-factor authentication, it becomes the confirmed number for your account.
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