For iPhone3G, iPhone3GS and iPhone4/4s/5/5c/5s: All Bluetooth-standard functions are supported. Make sure the latest iOS is installed in your iPhone. For first-generation and second-generation iPhone: The following features are supported: * Accept / reject calls * Redial * Stop / Pause music * Mute music * Play music * Headset volume control However, “Skip forward / backward” and the triggering of Voice Control function are not supported.