From Graphene’s FAQ

Many other devices are supported by GrapheneOS at a source level, and it can be built for them without modifications to the existing GrapheneOS source tree. Device support repositories for the Android Open Source Project can simply be dropped into the source tree, with at most minor modifications within them to support GrapheneOS. In most cases, substantial work beyond that will be needed to bring the support up to the same standards. For most devices, the hardware and firmware will prevent providing a reasonably secure device, regardless of the work put into device support.

To get down to your actual reservations about privacy: when you flash a new Graphene ROM onto your phone, you’re replacing all the software down to the low level stuff. The AOSP devs, google devs, XDA devs, and graphene devs refer to it at flashing the firmware. The only google code you’re running is the Android bootloader, which goes for any smartphone.

Further, if you look into it, “Google” pixels aren’t actually manufactured by Google. This means their hardware is about as trustworthy as any other phone’s. As to why Graphene only officially supports Pixels, I do not fully understand their needs/reasoning, just that they have determined it is the best for them.

Basically my point boils down to: if you have issues with the hardware, the same should go for any smartphone. If you’re bothered by google software, you needn’t worry insofar as you trust the Graphene devs. If you consider the Pixels “tainted” by association to Google, then the same should go for Graphene and any other ROMs, since the kernel is based off of the AOSP—a google run project—and any android phone, for the same reason.

All that being said, CalyxOS supports a slightly wider variety of devices.

Because fucking google pixels are the only devices that meet the GrapheneOS developer’s requirements.

I agree that it’s disappointing, both because google has incentives to abuse their control of the hardware and because of the electronic waste created by devices that lose support after an arbitrary number of years.

But that’s how it is, at least for now. In the meantime, there’s always LineageOS.

Google phones are pretty much the only ones that lets you relock the bootloader with your own signing keys. OnePlus used to, but not anymore. That means anyone can just flash anything to your phone and there’s no way to prevent it, except on Google’s phones. So, 30 seconds while you’re not looking and there’s a potentially a keylogger running as root on your phone.

With that in mind I can see why the authors aren’t interested in other devices. To release builds for a device you really need to own that device so you can test it on, maybe several of them. Each phone needs its own custom build and hacks and quirks. That’s expensive and time consuming. So you need someone with your particular model to be interested and volunteer in porting, maintaining and releasing builds of GrapheneOS for that phone. And the GrapheneOS guys are unlikely to buy those phones in the first place because it doesn’t have the features they want for their OS.

There’s probably builds floating around on XDA for GrapheneOS, for people like you that don’t need the security but just the privacy features. LineageOS’ list of official devices is pretty small but there’s unofficial builds for damn near anything on XDA, so it wouldn’t surprise me to see some unofficial GrapheneOS builds as well. Once you do have a device and a build setup, working on multiple ROMs at the same time is fairly easy, so I’ve seen the same developer releasing builds of whatever they can get to build.

https://grapheneos.org/faq#recommended-devices

Non-exhaustive list of requirements for future devices, which are standards met or exceeded by current Pixel devices:

Support for using alternate operating systems including full hardware security functionality

Complete monthly Android Security Bulletin patches without any regular delays longer than a week

At least 5 years of updates from launch for phones (Pixels now have 7) and 7 years for tablets

Vendor code updated to new monthly, quarterly and yearly releases of AOSP within several months to provide new security improvements (Pixels receive these in the month they’re released)

Linux 5.15 or Linux 6.1 Generic Kernel Image (GKI) support

Hardware accelerated virtualization usable by GrapheneOS (ideally pKVM to match Pixels but another usable implementation may be acceptable)

Hardware memory tagging (ARM MTE or equivalent)

BTI/PAC, CET or equivalent

PXN, SMEP or equivalent

PAN, SMAP or equivalent

Isolated radios (cellular, Wi-Fi, Bluetooth, NFC, etc.), GPU, SSD, media encode / decode, image processor and other components

Support for A/B updates of both the firmware and OS images with automatic rollback if the initial boot fails one or more times

Verified boot with rollback protection for firmware

Verified boot with rollback protection for the OS (Android Verified Boot)

Verified boot key fingerprint for yellow boot state displayed with a secure hash (non-truncated SHA-256 or better)

StrongBox keystore provided by secure element

Hardware key attestation support for the StrongBox keystore

Attest key support for hardware key attestation to provide pinning support

Weaver disk encryption key derivation throttling provided by secure element

Insider attack resistance for updates to the secure element (Owner user authentication required before updates are accepted)

Inline disk encryption acceleration with wrapped key support

64-bit-only device support code

Wi-Fi anonymity support including MAC address randomization, probe sequence number randomization and no other leaked identifiers

Because they are the only phones that allow relocking the bootloader with a custom ROM installed

You can use DivestOS which pretty much it offers anything that can be found on GrapheneOS. Also, DivestOS supports relocking the bootloader to many devices

Security enables privacy, that’s why they are commonly referenced together. From a hardware standpoint, Pixels are the most secure phones on the market and Google makes them with dev’s in mind. This is why Graphene OS, which is based on AOSP, currently only runs on Pixels.

Some alternatives are DivestOS, iodéOS or LineageOS for microG (or standard LineageOS). They are honestly not really comparable to GrapheneOS and target a different crowd but they offer varying levels of privacy improvement over standard Android and support a wide range of devices.

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