I love the feeling of privacy I’ve gained after moving from iOS to graphene with fairly little friction. However, one nagging feeling I haven’t been able to get over is carrier privacy. I do use a vpn to mask IP address however it seems there are still possible security issues like:
1) carrier constantly tracking location which seems to be fairly easy for ppl to obtain. This location data seems to be available, often without a warrant, for private investigators and law enforcement. It also can drag innocent ppl into trouble because you happened to be close to the location where a crime occurred.
2) the carrier/SIM card seems to have privileges/access and independent computing ability that are outside of the OS (similar to intel management engine on their chips)
The only possible mitigations I can think of are to buy an anonymous SIM card but never use its phone number but rather just it’s data service and utilize a separate voip type number over the data connection.