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can an average person use a linux phone?
Linux phones lack in all aspects compared to AOSP: security and privacy enforcement (mandatory sandboxing, permission control, full-system MAC, verified boot), usability and compatibility with the mobile app ecosystem. The much better approach would be to get a Google Pixel and install GrapheneOS. This will get you a very secure and private smartphone with almost perfect Android app compatibility. Recommend reading about Linux phones on madaidans-insecurities.github.io