You can watch Interstellar on all devices that support Netflix using a VPN. This includes Android, iOS, Windows, Mac, Linux, smart TVs, and more. The only condition is that your VPN should be compatible with these devices.  If your device doesn’t support VPNs, you can still set it up on your router and use the VPN connection on all devices connected to it. This way you can watch Interstellar on devices that don’t have VPN compatibility.