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this post was submitted on 22 Nov 2025
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GrapheneOS
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This is not feasible. You are not going to become an expert in mobile development on a timeline that makes any sense. Even if you did its still a massive under taking to port an end of life phone to work with a version of an OS that was never built to work with that phone, that's assuming its possible.
Just buy a used pixel 7a and start learning to develop apps on that.
I am considering that option, but part of the motivation is that I already have the device (two, actually) and I want to see what I can do with them. I don't want to just throw away perfectly good electronics if I can recycle / repurpose them. And since it's more of a hobby pursuit, really the only timeline is how long I can keep the hardware functional. I've already irreparably destroyed two phones, but I have also done a few successful screen / battery replacements, so I think I can get several more years of life out of these if I keep an eye on the batteries.
PostmarketOS recently added support for the Pixel 3, and I'd recommend that instead of what you've proposed. That gives you a great way to tinker with it alongside an active development community, without being completely on your own.
That's what I just did with my old 3a that was collecting dust after it went EOL, and it's been a really fun project.
That is a good point, and PostmarketOS is definitely one of the options in the mix. I actually didn't know it had official support, will have to give that another spin. I have Postmarket on another device but I've never gotten it running on a Pixel 3.