Phone Number of UPS Freight Customer Service is 1-800-333-7400. Information concerning the contact numbers of UPS Freight customer service and how to contact them are mentioned below. Get help and support for the services that UPS Freight provides such as information relating to package deliveries, postage rate of UPS Freight, tracking a package and report a fraud. If you have any other questions or concerns with UPS Freight then you can get assistance via Twitter by using @UPSHelp or if you want information regarding a tracking number or other private information, Direct Message @UPSHelp to get assistance.