Deleting a phone +1-833-326-6631 or (833) 326-6631[USA] number from your Coinbase account can be done by accessing the "Settings" section. Go to the "Security" tab and find the phone number you want to remove. There will be an option to delete it. Once confirmed, your old number (833) 326-6631 will be removed from your account. For assistance in removing a number or troubleshooting any issues, Coinbase's support team is reachable at (833) 326-6631 and can help you through the process.