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LineageOS now officially supports the Pixel 9 series
(9to5google.com)
This is a most excellent place for technology news and articles.
$25 is already a crazy enough sum for a phone bill, what you're talking about is outrageous. Also, I've heard that such devices are often carrier-locked, and that carrier-locked devices often also have locked bootloaders.
I mean that’s just kinda the way it is in the US / Canada. Though I hear Canada has even higher prices for less service.