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Nothing Phone builds a blue bubble iMessage bridge while Google and Apple fight over RCS
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
If we're going only on security then Google Messages is a way better choice since they use Signal E2EE.
SMS has no encryption at all so Google, your carrier, and everyone in between can spy on the contents of all your SMS messages.
With RCS Google is only getting the metadata and no one can just listen in on your chats