Ranked in these QuestionsQuestion Ranking
Pro Anonymized and encrypted communication
Blackphone is bundled with privacy services for anonymizing and encrypting communications.
Pro Runs a custom privacy focused build of Android
Blackphone has developed a fork of Android called PrivatOS with a focus on security and privacy. It closes all build in backdoors, and adds additional privacy features like anonymous search, privacy-enabled bundled apps, and better app permission control.
Con OS is not open source
Blackphone has announced plans to make their PrivatOS fork of Android open source in the future, but until then, 3rd parties cannot audit the OS to confirm their security claims.