RCS for iPhone is a messaging protocol that allows users to send and receive text messages, images, videos, and other content over a data connection instead of the traditional SMS/MMS network. This provides several benefits over SMS/MMS, including higher quality media, faster delivery times, and the ability to send and receive messages over Wi-Fi.
RCS is supported by a number of major carriers around the world, including Verizon, AT&T, T-Mobile, and Sprint. However, Apple has not yet adopted RCS for its iPhones, which means that iPhone users cannot send or receive RCS messages from users on other platforms.