Morse code is a long forgotten mode of communication, but this phone case is making a call back to the old messaging style. The S.M.S (smoke messaging system) is allowing users to send literal smoke signals through their smartphone devices.
This smokey phone case is a complex bit of technology. The smoke that comes from the phone case comes from a heated lamp oil that is administered by the user through a syringe. After that, the add-on does the rest. S.M.S allows users to agree on a common morse code to use so having a conversation may be difficult with many people but entirely possible. If you ever need some privacy from prying eyes, this is certainly one way to do it.