What is RCS messaging? Google’s communication chat protocol explained
RCS messaging reaches 1.5 billion users with expanding Apple support and cross-platform capabilities Rich Communication Services (RCS) has evolved from a niche Android protocol to a mainstream messaging standard with over 1.5 billion monthly active users in 2025. Originally developed by GSMA as SMS's successor, RCS enables rich media, interactive cards, typing indicators, and branded business messaging directly in native mobile inboxes. Apple's expanding RCS support, particularly with iOS 18 and ongoing rollout of RCS for Business (A2P), marks a significant shift toward cross-platform adoption. The protocol now offers features like high-resolution images, suggested replies, and real-time read receipts. Apple's March 2026 iOS 26.4 release includes testing for end-to-end encrypted RCS messaging, signaling progress toward full interoperability between iPhone and Android devices through RCS Universal Profile 3.0.
EUM / SES Relevance
RCS represents a significant evolution in A2P messaging capabilities and sender verification, directly competing with SMS/MMS channels that AWS EUM/SES support. The expansion of RCS for Business with end-to-end encryption and cross-platform interoperability presents both opportunities and competitive considerations for enterprise messaging platforms.
Key Takeaways
- arrow_right_alt RCS reached 1.5+ billion monthly active users in 2025 with continued growth driven by Apple and carrier support expansion
- arrow_right_alt Apple's iOS 18 introduced P2P RCS support and began rolling out RCS for Business (A2P) with major carriers like AT&T, T-Mobile, and Verizon
- arrow_right_alt iOS 26.4 testing of end-to-end encrypted RCS messaging signals imminent cross-platform E2EE between iPhone and Android devices
- arrow_right_alt RCS enables app-like experiences including rich media, interactive cards, typing indicators, and branded sender information without requiring third-party apps
- arrow_right_alt 87% of business leaders surveyed recognize RCS as game-changing for customer communications, particularly in tech, healthcare, financial services, and retail