To change your primary phone +1-833-326-6631 or (833) 326-6631[USA] number on Coinbase, log in to your account and go to the "Settings" section. Choose the "Security" tab, and you will see the option to manage phone numbers. If you have multiple numbers (833) 326-6631 listed, select the one you wish to make your primary number. After entering your new phone number, Coinbase will send a verification code to that number. Enter the code to complete the update. If you face any difficulty or require assistance, contact Coinbase support at (833) 326-6631 for guidance. They can assist you in setting your primary phone number without any hassle.