Nevermind, found this info online, so I thought I'd post it here:
Toyota Entune has the ability to send and recieve text messages.
When an incoming text message is received, Entune pops up a window on the display screen.
Press the PHONE button on the faceplate, and then touch MESSAGES. Touch INBOX.
If the car is stopped, it displays the text message. If you are driving, for safety Toyota Entune will read you the text message - cool!
(You can also touch the enevelope icon on any screen to bring up your messages screen)
To reply to a message, touch CALL SENDER (which is confusing) and then select REPLY FREE TEXT and put the message in and click send. You cannot reply to a text message when the vehicle is in motion - I guess Toyota thought it was too dangerous for you to be touching little buttons on the screen to type out a 140 character message while trying to merge onto the freeway