The Customer Service Center is the main live contact for GSO customers. We encourage our customers to use the GSO website for tracking, pickup, rating and other questions, but a live person is available at 800-322-5555.

Golden State Overnight (GSO) will send you a billing invoice twice each month on the 15th and the last day of the month. The invoice dated the 15th includes shipments picked up between the first day of the month and the 15th. The second invoice covers shipments picked up between the 16th and the last day of the month.

Learn more about invoicing and billing options, including itemized invoice details, billing terms, invoice options (Web Invoicing, E-billing, Consolidated E-billing, and Paper invoice options), and payment options.

Claims of loss or damage to a package must be submitted through a completed claim request form to GSO within 6 months of the shipment pickup date. Claim forms are available through the Customer Service Center.