The 2014-2015 ES models had this same button. It was for making hands-free Bluetooth calls, but that was with the old radio and Bluetooth module. I assume voice control is something the Android/CarPlay radio has?
Only if it's hooked to the phone with the USB cable. Otherwise it says function not available.
-Karl B. 2015 DE 5 speed x 2 and 2015 ES CVT. Plenty of other cars as well.