If you’ve lost your phone or changed your number, you can update the number used for SMS authentication when you log in to Stripe Express.

1. Go to express.stripe.com and enter the email address for your account.
2. On the next screen where a 6-digit verification code is requested, select I no longer have access to this phone number.
   
3. Follow the subsequent steps to authenticate your request and add a new phone number to the account.