How you can 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:
Instagram app for Android and iPhone and Instagram Lite app for Android
  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 Text message, then tap toggle next to Text message.
  5. If your account doesn't have a confirmed phone number, you'll be asked to enter one. After entering the phone number, tap Next.
  6. Tap Done.
Instagram.com from a mobile browser
  1. Tap your profile picture in the bottom right to go to your profile.
  2. Tap settings at the top.
  3. Tap Privacy and Security
  4. Below Two-Factor Authentication, tap Edit Two-Factor Authentication Setting.
  5. Tap the box next to Use Text Message.
  6. If your account doesn't have a confirmed phone number, you'll be asked to enter one.
  7. Tap Done.
Instagram.com from a computer
  1. Click menuMore in the bottom left, then click Settingssettings.
  2. Click Privacy and Security
  3. Below Two-Factor Authentication, click Edit Two-Factor Authentication Setting.
  4. Click the box next to Use Text Message.
  5. If your account doesn't have a confirmed phone number, you'll be asked to enter one. Click 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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