Contact Us
Customer Service:
Chat with an Expert: reach out to a specialist by clicking the
blue box located on the bottom right-side of this page.
Email: customerservice@gls-us.com
Phone: 800-322-5555 option 1
Fax: 916-636-5101
Sales:
Email: sales@gls-us.com
Phone: 800-322-5555 option 4
Billing:
Email: billing@gls-us.com
Phone: 800-322-5555 option 6
Fax: 408-543-8301
Corporate Address:
GLS US
4000 Executive Parkway
Suite 295
San Ramon, CA 94583