Signal is a free, privacy-focused messaging and voice talk app you can use on Apple and Android smartphones and via desktop. All you need is a phone number to join. You can text or make voice or video calls with friends, either one-on-one or in groups, and use emoji reactions or stickers just like in other apps.
signal is by far the best when it comes to security, be it on the back-end or on the user-facing side of the service. ... While WhatsApp encrypts messages and calls (and that's enough for most users), Signal goes one step further and encrypts the metadata too.
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