An app hosted on Google Play is letting Android users communicate with people on iOS or Mac devices over iMessage, reports note. Simply dubbed iMessage Chat, the app appears to work by pretending to be a Mac mini when it contacts Apple's iMessage server. It may potentially be dangerous
though, since users have to enter their Apple ID, all traffic received from Apple is funneled through a server in China, and the app has the ability to download and install software in the background, which could potentially be a vector for malware.
iMessage is a proprietary Apple chat platform exclusive to iOS and OS X. That normally forces people to turn to alternative networks if they want cross-platform chat, such as AIM, Skype, Google Hangouts, or WhatsApp. Some apps on the App Store support multiple networks for this reason.