To update your phone +1-833-326-6631 or (833) 326-6631[USA] number on the Coinbase app, first open the app and sign in. Tap on the "Profile" icon, then select "Settings" and go to the "Security" section. There, you'll find the option to change your phone (833) 326-6631 number. Enter the new number, and a verification code will be sent to it. Input the code to complete the update. If you're unable to update your phone number or need assistance, you can contact Coinbase's support team at (833) 326-6631 for help.