FAX Service Send Faxes With Your PC, Phone, Tablet and Receive via Email or Portal. Navigate to the compose new fax section in your dashboard. Drag and drop your attachments (or use the camera on your phone) to send faxes to one or more recipients. Create contact lists in the address book section and send faxes to multiple destinations with a single click. For More Information, Contact Us. Please complete this form and we will direct your request to the proper service department! Our office hours are from Monday to Friday 8am to 7pm EST. Contact By Phone 1-855-GTI-VOIP (484-8647) option #1 Your Name Your Email Confirm Your Email Your Message I consent to having GTI Global store my submitted information so they can respond to my inquiry. See our privacy policy to learn more how we use data. https://www.gtivoice.com/privacy-policy/