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Signal Signal (new window) is widely considered to be the most secure encrypted messaging app, with endorsements from numerous experts, including Edward Snowden and renowned security expert Bruce Schneier . It supports texts, group texts, as well as voice, video, and group calls. Platforms : Android, iOS, Linux, macOS, and Windows Price : Free Threema Threema (new window) , unlike Signal, does not require a phone number to create an account, which means Threema is as close...