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iPhone owners who want to text users of non-Apple devices more securely should install iOS 26.5, which Apple released on Monday. The update introduces support for end-to-end encryption when using Rich Communication Services (RCS). The encryption, which makes messages unreadable outside the sending and receiving devices, is available to users with the latest version of Google Messages and to iPhone users on AT&T, T-Mobile, Verizon, and other major carriers .

RRCS, heavily promoted by Google as an answer to Apple's iMessage, is part of a broader shift away from the SMS messaging that defined early cell phones.…