On 2020-09-29, Marcus MERIGHI <mcmer-open...@tor.at> wrote: > h...@stare.cz (Jan Stary), 2020.09.29 (Tue) 10:19 (CEST): >> This is current/amd64 on a ThinkPad T400 (dmesg below). > > I don't see any umsm(4) or umb(4) device in you dmesg. > (Or anything else that looks like a 2/3/4/5G modem.) > > Could it be that the SIM slot is provided on all models, > though yours doesn't have the "modem"-hardware?
Yes that is very likely. > Or do you need to enable it in the BIOS? Check it isn't just disabled in BIOS, if not you should be able to add a 3G card easily enough (you can find them stripped out of old Thinkpads on ebay etc), but LTE is likely to be trickier, I don't think T400 originally came with them and the BIOS has a whitelist so as well as the card you'll probably need to find a hacked BIOS too. One problem with 3g is that most devices you'll find emulate serial ports so you have to deal with pppd mess. With LTE quite a few of the cards are supported by umb(4) which are far less annoying.
