iMessage functions exclusively on Apple platforms: macOS, iOS, iPadOS, and watchOS.Ĭore features of iMessage, available on all supported platforms, include sending texts, images, videos, and documents getting delivery and read statuses (read receipts) and end-to-end encryption so only the sender and recipient - no one else, including Apple itself - can read the messages. IMessage is an instant messaging service developed by Apple Inc. IPhone, Apple Watch, iPad, iPod Touch, Mac A thread of conversation and media in the Messages application on iOS 8