Thanks for sharing your setup. Do you use VoIP services of any kind or do you use the SIM card for legacy calls/sms?

That is one area I am still trying to figure out after switching to GrapheneOS. SIM cards are continuously pinging out one's location (within a rough degree of accuracy). If I give out the phone number associated with my SIM card (that I purchase without KYC) to contacts, they save my number and it is inevitably hoovered up by google, facebook, apple, etc... and therefore the number is tied to my identity despite my purchasing it non-kyc. We have seen many examples of cell phone companies disclosing user call/sms/location data either by hacks of their databases or by their willing selling of the information.

If instead, I were to utilize a VoIP number as my primary publicly known number (the SIM card would be used solely for mobile data, no legacy calls/sms), and if I were to keep an always on VPN on the phone, my location data would be divorced from the publicly known phone number.

I believe Michael Bazzell talks about this a bit in his Mobile Privacy Guide and also Gabriel Custodiet in The Watchman Guide to Privacy book.

Would love to get your thoughts on it though. Sometimes I think its overkill to only use VoIP, but it is crazy how much the telephone providers, big tech companies, and government collect on all of us so that makes me think it may be worthwhile...