Quickbooks Support Phone Number. Quickbooks phone support is available Monday through Friday from 5:00 a.m. to 5:00 p.m. PT. If your Quickbooks Subscription includes Premium Support, log in to your Quickbooksdownload.com account to find that number. The phone number will be displayed near the top of the Quickbooks account page. Monday through Friday, from 5:00 a.m. to 5:00 p.m. PT, premium support is available. Our chat support is available seven days a week from 5:00 am to 5:00 pm PT.