RCS support in iOS 18 refers to the integration of Rich Communication Services in Apple's Messages app1. This upgrade allows iPhone users to send and receive higher-quality images and videos, see typing indicators, get read receipts, and start group chats with Android users, enhancing the messaging experience between iPhone and Android devices2. However, messages from Android devices will still appear as green bubbles in iMessage.
Not compressing audio and video messages preserves the original quality, ensuring a clearer and more enjoyable listening and viewing experience. This is particularly important for media shared between devices, as compression can lead to reduced audio clarity and visual artifacts. Additionally, group chats benefit from uncompressed media, as details remain intact and communication is more effective.