From everything I've read regarding bluetooth, only some phones are fully compatible with the system. Go to Lexus. com and at the bottom of the page, click on contact lexus (knowledge center) then you can search for your phone model to see what is and isn't compatible. I have a Samsung a737 and only some of my features are compatible. Like yours, my transfer ability is not.
Good luck. I've been searching for how to program numbers into the system so they're already there and I can just press the button instead of having to be stopped to enter the number.