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How RCS on iPhone Will Make Texting Better for Everyone
(www.cnet.com)
This is a most excellent place for technology news and articles.
WhatsApp does use the Signal protocol, but unlike Signal only applies it to Messages, Calls and Status.
Your profile info, who you're talking to, when you're using the service, groups you're in, channels you're following and much more is left unprotected intentionally.
For instance, Signal sends your profile end-to-end-encrypted instead of leaving it freely accessible on servers.