Apple released iOS 18.5 on Monday with beta support for end-to-end encrypted RCS messaging, marking a shift toward replacing unencrypted SMS on iPhones. The feature rolls out to iOS 18.5 users with participating carriers and Android users running the latest Google Messages app.
RCS, or Rich Communication Services, provides a modern replacement for SMS with support for larger file transfers, read receipts, and typing indicators. Unlike traditional SMS, which transmits messages in plaintext, E2EE RCS ensures that only the sender and recipient can read message content. The encryption keys remain on user devices, preventing carriers and service providers from accessing message data.
Apple frames the implementation as part of a "cross-industry effort" to modernize mobile messaging infrastructure. The company previously resisted RCS adoption, citing security concerns about carrier involvement. The new beta approach addresses those concerns by layering end-to-end encryption atop RCS protocols, creating a secure channel between iPhone and Android devices.
The rollout depends on carrier support. Not all networks immediately implement RCS infrastructure, so availability varies by region and provider. Users with compatible carriers will see E2EE RCS activated by default when messaging Android contacts via Google Messages.
This change eliminates a long-standing friction point for cross-platform communication. iPhones default to SMS when messaging non-Apple devices, exposing those conversations to interception. E2EE RCS removes that vulnerability while maintaining backward compatibility with devices lacking RCS support.
The beta status allows Apple and partners to refine the implementation before full deployment. Security researchers will likely scrutinize the encryption mechanisms and key exchange protocols. Industry adoption of this standard could reshape how billions of people exchange sensitive information daily.