360 Checking accounts are available both online and in person at Capital One locations. If you’d like to open your account and bank with us in person, stop in at your closest Capital One location. If you’d prefer to bank online-only, you can make deposits and transfers using the Capital One mobile app, one of our deposit-taking ATMs, or by mailing in a check for deposit. Capital One Investing Online Accounts; General customer service phone support. 1-877-383-4802 For faster customer service, please use the links above to contact the appropriate customer service center for your specific needs. Contact us by U.S. Mail. Find the right address to mail Capital One about the following issues: Mailing a credit card payment