The best alternatives to CopperheadOS are JUMBO, Ghostery, and GrapheneOS. If these 3 options don't work for you, we've listed a few more alternatives below.
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Ever wanted to delete old tweets or old Facebook posts? Stop location tracking or simply secure your personal data?
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GrapheneOS is an Android-based, security-hardened, privacy focused, free and open-source, mobile operating system for selected smartphones. It was known as Android Hardening until March 2019, and is focused on privacy and security. It is compatible with several Google Pixel smartphones.