Citizen Lab recommend GrapheneOS

Onion

In an article written on may 30, the prestigious Citizen Lab recommended GrapheneOS as the best choice for android user to protect themselves against state-sponsored spyware : https://citizenlab.ca/2024/05/pegasus-russian-belarusian-speaking-opposition-media-europe/

ErnestThornhill

To clarify, the article states that, since there is no feature similar to Lockdown Mode available on Android devices, it's recommended that you seek expert advice on whether resources, such as more security-focused operating systems (a link directs you to the GrapheneOS website), may be available for your specific device.

Onion

That's right but as far as I know, there's nothing as secure as GrapheneOS on Android for the people.

popsicleman

Another Citizen Lab article more explicitly mentions GrapheneOS, with some theory on how IPC side-channels can be be utilised to bypass absolute permissions.

GrapheneOS, an open source Android-based operating system, implements a NETWORK permission. However, denying this permission can lead to surprising results where apps can still communicate with the Internet via IPC with other apps. As such, we recommend that both the developers of Android and iOS work toward a meaningful INTERNET permission that would adequately inform users of whether an app communicates over the Internet.