RCS on iPhone was supposed to be a saving grace when texting Android users from iOS. In reality, it comes with some problems, including a major security vulnerability.

With RCS on iOS, you’ll get major improvements like high-resolution media, typing indicators, and read receipts when you’re texting with people on other phones that also support RCS. In its iOS 18 press release, Apple also highlights support for “more reliable group messaging compared to SMS and MMS.”

Apple publicly launched the iOS 18 update on Monday, and iMessages saw massive improvements, particularly in chats with Android users.