The smart ring will have a touch-screen that will allow applications to be used despite of its tiny dimensions. For texting, classic typing is not supported but Apple plans to use the built-in microphone to allow users to dictate the messages. When a incoming messages arrives the ring will vibrate as an alert. The patent description provides more juicy details regarding what we can expect for the future.
If iRing will be prototyped we can expect it to replace the smart bracelets people use today. With biometric sensors one will be able to measure their temperature, perspiration levels and even to capture their heart rate. One of the most important features of the ring will be to use its in built accelerometer to detect finger movement and translate it digitally to detected hand-writing thus allowing anyone to take notes on the fly.