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hesitantapplegal collect some data/metadata
that is correct. There are other RCS implementations depending on your carrier that might be available, but I haven't researched this in detail. I see RCS as a bandaid and don't use it personally. I have been able to migrate all of my regular contacts to Signal, some are on Telegram, the rest I almost never talk to can use SMS.
I was thinking of attempting to do it without Google Play Services too
That is commendable, but I fear that you will dislike GOS mostly because of some apps not working that rely on Play Services. Usually I would agree, but for new users this might be very off-putting.
I like the idea of testing it out on a cheaper or older device, but at the same time, I want to make sure I'm giving Graphene a fair shot. If I go from my relatively new iPhone 14 Pro to a few-year-old Pixel, I might end up not loving Graphene just because of the hardware downgrade. I want to be able to judge it on its own merits, not just because I'm using it on an older phone.
The software is identical on all supported Pixel devices. The only things you may not like would be the camera, display or maybe cell service. In that case you can always remind yourself that this is a hardware limitation and can be fixed with a more up-to-date and more premium device. I daily a 9 Pro XL and it's mostly on par with my previous 14 Pro Max except for slightly weaker speakers - that's about it. Apart from that, it's a superb phone for Graphene.