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Neither does SMS...

• threeseed 5y ago
  The difference is that SMS is a dumb, text-only format with no features. And so it made it easy for people to switch to WhatsApp, iMessage etc as they could easily offer compelling features. RCS has a lot of those compelling features and so would be able to take market share away from those proprietary apps. Great right ? Well no because RCS is unencrypted specifically so that carriers and governments can read your messages.