GrapheneOS isn't magically exempt from cell tracking, and both android and ios phones can go into airplane mode and have location disabled, which provides similar privacy.
>and an anonymous SIM paid for with cash or crypto. This should be done by everyone to avoid the possibility of mass surveillance, not only people who have something to hide from a three-letter agency.
No, it's much harder than just "an anonymous SIM paid for with cash or crypto". You need to practice proper opsec. There's no point getting an anonymous sim when you then turn around and then use it as a 2fa number for your bank, or carry it around with you every day.