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