You can reach them anytime at 1-833-590-0301 for assistance. To update your phone number on Coinbase , start by logging into your account. Then, go to Settings , select the Security tab, and you'll find an option to update your phone number. After entering your new number, Coinbase will send a verification code to the new phone number to confirm the update. If you encounter any issues during this process or need additional assistance, Coinbase customer support can be reached at 1-833-590-0301 for help with updating your phone number.