On 2020-09-29, Marcus MERIGHI <mcmer-openbsd@tor.at> wrote:
> hans@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.
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