Text Message RCS (Rich Communication Services) on iPhone is a modern messaging protocol introduced with iOS 18 that enhances traditional SMS/MMS texting by adding features similar to iMessage but works across Apple and non-Apple devices, including Android phones. RCS allows users to send high-resolution photos and videos, links, and supports read receipts, typing indicators, and group chats with the ability to add or remove participants

. Key points about RCS on iPhone:

• RCS messages appear as green text bubbles, distinguishing them from iMessage's blue bubbles

• Unlike iMessage, RCS messages are not end-to-end encrypted, meaning they are less secure during transmission

• RCS is carrier-dependent; your cellular carrier must support RCS for it to work on your iPhone

• To use RCS, you need iOS 18 or later and a compatible carrier plan

• You can enable or disable RCS on iPhone by going to Settings > Messages > RCS Messaging and toggling it on or off. Activation may take a few hours

• RCS improves texting between iPhone and Android devices, solving issues like blurry photos or missing emoji reactions common with SMS/MMS

In summary, RCS on iPhone is Apple's adoption of the industry standard for richer, cross-platform texting that bridges the gap between iMessage and traditional SMS, providing a better messaging experience especially when communicating with Android users