The Google Pixel supports GrapheneOS, the free and open-source mobile operating system we currently recommend for use on mobile devices.
Note that using a custom Android operating system means you have to make the compromise between app availibility and stability, and having decent security and privacy. This operating system does not come with Google Play Services by default, nor is it possible to install Google Play Services or microG. We recommend using F-Droid for app installations as needed, and to avoid third-party apps as much as possible. For this reason, a Pixel with GrapheneOS may not be the best choice for less technical users and users requiring the use of many third-party apps.
+ +The Google Pixel 3 has a new hardware security chip, the Titan M, making it more secure than its predecessors or other Android devices. This chip is tasked with protecting your device against boot-time attacks, too many log-in attempts, and secure data storage, among other security-related processes. Unlike other mobile hardware security solutions such as ARM TrustZone, the Titan M is a dedicated chip with physically separate RAM and processing power, preventing sidechannel attacks (a la Spectre, Meltdown, Rowhammer).