Need Help? Call anytime at 1-833-590-0301 for assistance. To update your phone number in Coinbase , head to your Settings section and select Security . Under the Security tab, you'll find the option to update your phone number. After entering your new number, a verification code will be sent to your new phone. Enter this code to confirm the update. For further assistance or if you face any issues during this process, you can always contact Coinbase support at 1-833-590-0301 to ensure everything is updated correctly.