[@hakan_geijer](https://kolektiva.social/@hakan_geijer ) posted this explanation for Smartphone security, definitely worth a read:
https://kolektiva.social/@hakan_geijer/113890539596938709
Links to this downloadable PDF guide https://opsec.riotmedicine.net/downloads#mobile-phone-security
Edit: seems like someone who has the motivation and time should make a mashup of both guides.