this post was submitted on 09 Jul 2023
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Check from psref of X200 is the sim card reader for 2G or 3G internet. Then check is it enabled in the bios.
If you're using Linux, then read this: https://wiki.archlinux.org/title/ThinkPad_mobile_Internet
Also keep in mind that in many 1st world countries they've almost entirely phased out 2 and 3g so it probably won't even work.
In the US it's almost entirely gone, I'm sure the EU will follow shortly if they haven't already. I know T-Mobile at least claims they've entirely turned off their 2g and 3g except for a few areas, and Verizon is more or less the same.
3g already phased out also in South East Asia... most frequency are used for digital TV