What are your proposed alternative then ?

How can you know or be sure that there are no backdoor on device ?

"GrapheneOS is an open source project with an open development process.The GrapheneOS sources are hosted in the GrapheneOS organization on 

tech

deleted by author

>How can you know or be sure that there are no backdoor on device ?

"GrapheneOS is an open source project with an open development process.The GrapheneOS sources are hosted in the GrapheneOS organization on [GitHub](
https://github.com/GrapheneOS)"