Windows 10 on ARM on the Lumia 950 XL has made tremendous progress over the last year, but there has always been one issue which has prevented it from being taken seriously and that is the lack of support for cellular connectivity.
Now it seems that barrier has been breached, going by the tweets of one of the main hackers working on the project.
Gustave Monce posted the following screenshots from his handset, showing a working driver for the cellular modem in the handset.
Update: Gustave added some more details:
Here's a short update on Cellular for 950 XL:
We got a Mobile Broadband Driver running. It is able to read the SIM slot, turn on the Modem, read the SIM card, start the Modem firmware, turn on or off the radios at will (I've checked), communicate w/ OS, but no Data working yet. pic.twitter.com/9pkr971Gn7
— Gustave Monce (@gus33000) April 11, 2019
This means a nearly fully functional handset is now available, with the main outstanding issue being the cameras not working.
If you want to rescue an old handset and put it to some interesting use, however, find the Installer at GitHub here.