Your phone could be made of magic, but it's still gonna leave a record of your movements with the cellular towers.

My phone is GrapheneOS too, but all cellular modems are inherently compromised

You'd need your phone not to be linked to your id. Ideally without an IMEI number (if that's possible). You would have to make sure your email, social media BANKING on your phone were totally anonymous. Even if you're using an esim which is not connected to your id, your phone will still track your ...

so you don't install any google apps?

lol every chip has a backdoor inside