After a successful Bluetooth connection and installation of ZeRound App, you
can read SMS messages on your ZeRound (see article "How to receive my notifications on my ZeRound?")
Go to SMS menu. Click on the SMS you want to reply to, scroll down and select the answer mode.
You can reply using the SMS template (Android only) or directly via the voice control feature (Google now)
Go to SMS menu. Click on the SMS you want to reply to, scroll down and press the voice command icon to launch Siri and dictate your SMS reply.