You can use your messaging service while on the move. When you receive a new message, the sender’s name will appear on the touchscreen. Tap and let Google dictate the message. Google will then ask if you want to reply. Say yes and dictate the message to Google. You can review the message and if you’re happy, send it to the recipient.
If you want to send a message, tell Google that you want to send a message and to whom. Dictate the message and, again, Google will let you review it before you tell it to send the message.