How do I change the phone number that I use for two-factor authentication?
To change the phone number that receives text messages (SMS) for two-factor authentication:
  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. If two-factor authentication is already on, tap Text Message, then tap next to Text Message to turn it off.
  5. Tap Turn Off to remove two-factor authentication from the old confirmed phone number.
  6. Tap next to Text Message to turn on two-factor authentication again.
  7. Instead of entering a code, tap Change Phone Number below Next.
  8. Enter the new phone number you’d like to use, then tap Next.
  9. You'll be sent a text message (SMS) to the new phone number with a 6-digit security code. Enter the code in the Instagram app, then tap Next.
  10. You'll see a list of recovery codes. Tap Done to complete the two-factor authentication process.
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