Need Help? Call anytime at 1-833-590-0301 for assistance. To remove your old phone number from Coinbase , simply go to your Settings page, click on the Security tab, and you'll find the option to update your phone number. Delete the old number and enter your new one. A verification code will be sent to your new phone number to confirm the update. If you need help during this process or if you're facing any difficulties, feel free to reach out to Coinbase support at 1-833-590-0301 .