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YSK: Signal is a great secure private messenger app comparable to others on the market.
Got a surprising amount of contacts to move into signal from Whatsapp, though the iMessage gang can't stop iMessaging.
As an android user, I don't see why you would want to use something that restricts your secure messaging to a single platform.
As a result of Signal's poor decision to stop SMS service, I frequently forget to check my SMS app for messages.