If you need to update your Amazon security phone number, the process is straightforward once you know where to look.
This guide explains how to change two factor authentication phone number on Amazon and what to do if you no longer have access to the old number.
What Amazon Two-Factor Authentication Uses Your Phone Number For
Amazon uses two-factor authentication, also called 2-step verification, to protect account sign-in.
When enabled, Amazon may send a one-time password by SMS or call, depending on your settings and region.
Your phone number can be used for several security and account functions:
- Receiving verification codes during sign-in
- Confirming suspicious login attempts
- Helping recover access to your account
- Receiving security alerts tied to account activity
If your number changes, your account may become harder to access unless you update the security settings promptly.
Before You Change the Number
Before updating your Amazon two-factor authentication phone number, confirm that you can still sign in to your account.
In many cases, you need access to your Amazon account page and the current verification method.
Have the following ready:
- Your Amazon login email or mobile number
- Access to the current account session if already signed in
- A new phone number that can receive text messages or calls
- Your backup authentication method, if you set one up
If you recently changed your SIM card, moved to a new carrier, or replaced your phone, update the number as soon as possible to prevent sign-in interruptions.
How to Change Two Factor Authentication Phone Number on Amazon
You can usually update the phone number from your Amazon account security settings.
The exact labels may vary slightly depending on whether you are using the Amazon website or the mobile app.
Using the Amazon Website
- Sign in to your Amazon account.
- Go to Account & Lists and open Your Account.
- Select Login & security or a similar security settings option.
- Find Two-Step Verification, 2-Step Verification, or Sign-in security.
- Edit the phone number linked to verification.
- Enter your new mobile number.
- Verify the change using the code Amazon sends to the new number.
Using the Amazon App
- Open the Amazon app and sign in.
- Tap the menu icon and go to Account.
- Open Login & security.
- Locate your two-factor authentication or sign-in verification settings.
- Update the phone number and confirm the change.
After the update, Amazon may ask you to reauthenticate or confirm the change with a code.
This is normal and helps prevent unauthorized account edits.
What If You Cannot Receive Codes on the Old Number?
If your old number is disconnected, lost, or unavailable, the process depends on whether you are already signed in.
If you are signed in, you may still be able to update the number from account settings without needing the old code every time.
If Amazon prompts for verification on the old number and you cannot access it, try these options:
- Use a backup sign-in method if one exists
- Check whether you are still signed in on another device
- Use account recovery prompts on the login page
- Contact Amazon customer service for help with account access
Amazon support may ask for identity verification before allowing security changes.
That is standard for account protection.
How to Avoid Locking Yourself Out
Changing a two-factor authentication number can create problems if the update is done without a fallback method.
A few simple precautions reduce the risk of lockout.
- Keep your old number active until the new one is confirmed
- Make sure the new number can receive SMS and voice calls if required
- Check that your account email is current and accessible
- Review backup authentication options after the update
- Save any recovery codes if Amazon provides them
If you use the same number for multiple services, update each account separately.
Do not assume that changing your phone number with your mobile carrier automatically updates Amazon.
Security Settings to Review After the Update
Once you know how to change two factor authentication phone number on Amazon, it is a good time to review the rest of your login security.
A more complete setup reduces the chance of unauthorized access.
Check these settings:
- Password strength — use a unique, long password
- Backup email — confirm it is current and accessible
- Trusted devices — sign out of devices you no longer use
- Notification preferences — enable login alerts if available
- Payment method security — verify saved cards and addresses
Amazon account security is strongest when your password, verification method, and recovery information all match your current contact details.
Common Problems and Fixes
Amazon Keeps Sending Codes to the Old Number?
This usually means the old number is still saved in your account profile or verification settings.
Return to Login & security and check whether the new number was fully saved.
If necessary, sign out and sign back in before trying again.
The New Number Does Not Accept the Code?
Make sure the number is entered in the correct international format if you are outside the United States.
Also confirm that your phone can receive texts, is not blocking short codes, and does not have message filtering enabled.
You Cannot Find Two-Step Verification in Your Account?
Amazon occasionally updates menu names or security layouts.
Look for related terms such as sign-in security, login & security, or two-step verification settings.
If the web version is unclear, check the Amazon app.
Your Account Is Asking for a Code During Every Sign-In?
That can happen if Amazon does not recognize the device or browser.
You may be able to reduce repeated prompts by using the same trusted device and avoiding frequent cookie clearing.
When to Contact Amazon Support
If you cannot access your account, cannot verify the old number, or suspect that someone else changed your security settings, contact Amazon support right away.
Provide only the information requested through official Amazon channels.
Support is especially useful if:
- Your account is locked and you cannot sign in
- Your old phone number was reassigned to someone else
- You are seeing unfamiliar login activity
- You need help restoring a lost verification method
For the fastest resolution, be ready to confirm your identity, recent orders, and current contact information.
Frequently Checked Best Practices for Amazon Account Security
Keeping your account secure is not only about changing a phone number.
It is also about reducing dependence on a single point of failure and making sure your recovery details are always current.
- Review account security after every phone number change
- Update Amazon settings before canceling a carrier plan
- Use a dedicated email address that you check regularly
- Monitor order history for unfamiliar purchases
- Remove devices you no longer own from your account
Staying proactive makes future verification changes easier and lowers the risk of account recovery problems later.