There are no incentives to improve end user privacy with those who specify telco standards.

There are some interesting blogs articles out there on what has been done in 5g. Basically moving from transmitting a fixed device imsi, to temporary identifiers. https://www.ericsson.com/en/blog/2019/5/fighting-imsi-catche...

> Anyone know of any progress in 6G, that would improve privacy in this area?

One of members of numerous 6G working groups is Huawei. If you remember, they recently proposed to replace the whole IP protocol with one where every packet must be cryptosigned by ISP.

This SIM feels like a complete BS. IMSI is managed by the phone, not SIM.