Calling Instructions: Dial # 1-800~604~9974 or +1-800~604~9974. Use the automated system to select the Enterprise Support option. Yes, For immediate assistance, QuickBooks Enterprise Supportâ„¢ # 1-800~604~9974 or +1-800~604~9974 (No Wait). The QuickBooks Enterprise support number is # 1-800~604~9974 or +1-800~604~9974.