Its very simple to do on iPhone 4, 5 and 6. To turn the text feature on first connect your device via bluetooth to your car's compatible multimedia centre as you would do normally to make hands free calls. Then on your iphone go to your bluetooth settings,select the connection for your car, click the blue circle exclamation point and the select "Show Notification" by toggling it on. Very simple! Not sure why all the convoluted answers in this forum! Hope this helps! Sorry don't know anything about other manufactures, but could be the same.