iPhones are expensive surveillance tools.

You need to question your own intelligence if you fell for their convienece over security/privacy marketing campaign.

GrapheneOS makes it so easy and smooth to leave, that you need to question the intelligence of people not doing it instantly.

Also consider getting a second anonymous esim powered device that only is meant to give the second device access to the Tor or VPN routed device over WiFi. 

 Not running GrapheneOS might be for several reasons, including not being aware that it exists.

Like your second device idea.