As noted, Trust.Zone only supplies a native client for Windows machines. You can still use any device you like with Trust.Zone, but you'll have to either configure the operating system's built-in VPN client manually or download a third-party client like the one available for OpenVPN connections. It's a tedious process and not consumer friendly by any stretch of the imagination.
When I first began testing Trust.Zone, installing the client on my Lenovo ThinkPad T460s laptop running Windows 10 was a bit of a mess. Everything seemed fine, but I received cryptic error messages whenever I tried to connect to the VPN.