I have a Lenovo ThinkPad P50 which has a SIM card slot and up until a few months ago offered Mobile broadband connectivity options. These options disappeared after a major Windows 10 update (I think this was maybe around March 2018, but might have been before that). I can no longer find the option to enable the mobile broadband. I've re-downloaded the WWAN drivers from Lenovo and from Sierra wireless, and now I'm stuck for what to try next. Have tried putting a SIM card in to see if Windows will detect it, but it just appears to be no longer an option. I've seen a few posts elsewhere that make it seem like I'm not the only one with this problem, but I've seen no real solutions offered other than updating the drivers.

What can I do to get my mobile broadband working again?