https://www.cnet.com/roadshow/news/bentleys-advanced-connectivity-wi-fi-fast-secure/

The router that enables this connectivity is a bespoke creation that hides in a car's trunk. It can wield three different SIM cards, allowing the vehicle to aggregate multiple networks' worth of bandwidth. The router links to a hub with a physical broadband connection, which supplies the vehicle with internet access through a dedicated app on a phone or tablet.

Bentley told MSN that, in theory, one passenger could be streaming a movie while another passenger takes a Skype car, while another passenger could be downloading and uploading large files. That's a lot of bandwidth, but that's why Bentley had to go back to the drawing board and work with Viasat on a bespoke solution. Other Wi-Fi hotspots promise connectivity for even double digits' worth of devices, but that traffic is all channeled through a single provider with limited bandwidth.