Click the Bluetooth icon on the model 3 touchscreen then select your paired phone to access the settings you need to change. Took me a bit to find out how to get there since you can't access those settings from the main menu. I have an android phone (pixel 2xl) and texting and voice texting works.
That didn’t work, it wouldn’t turn on. I deleted the car Bluetooth setting on my phone and re-added it. That seemed to fix it.