

Good catch, while I guess they’re not using postmarketOS, that’s what was supported on the device i had, and what enabled me to test out the mobile version to gnome shell, and try out the phone app ecosystem. It seems like its ready for prime time, especially since waydroid performs so well, android apps can fill the void for any missing native Linux apps.
This is a thing, but its not very popular outside of corporate machines as I would guess most people don’t want to pay for an extra phone data plan specifically for their laptop, and the manufacturers want to cut costs for their laptops. It usually isn’t available to normal consumer line laptops though, like I said, its mostly only supported on business line laptops.
https://en.m.wikipedia.org/wiki/Wireless_WAN
https://www.aliexpress.us/item/2251832669623539.html
https://www.parts-people.com/blog/2012/10/17/dell-latitude-e6420-wireless-wwan-card-removal-and-installation/