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iMessage does not use SMS at all. It is 100% IP based like WhatsApp. The Messages app on iOS devices can switch to SMS if the iMessage service is not available
by snowwrestler 6y ago
iMessage does not use SMS at all. It is 100% IP based like WhatsApp.
The Messages app on iOS devices can switch to SMS if the iMessage service is not available. It would certainly be possible for Apple to design an iMessage-only client that will not do that. But they don’t want to.