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 profile or your profile picture in the bottom right to go to your profile.
  2. Tap more options in the top right, then tap settingsSettings.
  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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