It seems like a dystopian system, that we litterely can not hide from our governments without turning off our smartphones
That’s basically it.
However SIM cards that aren’t tied to people usually ends up scenarios like the US have where SIM swap attacks are common and you’ve a LOT of identity fraud. Note that we’ve an increasing number of services sending information and validation codes via SMS like banking apps and whatnot and you don’t secure the SIMs anyone will be able to get a replacement SIM because “I got my phone stolen” and you’ll have zero security.