They do, but not while the vehicle is moving. There is a good reason for this.
Diesel Benz,
Have you been able to respond to text/SMS message from the HU while stationary? As noted previously, I have a 'grayed out' menu option that says, "Use" in my text/sms menu which I suspect is for a voice controlled reply but have never been able to reply even with vehicle stationary. I'm wondering if that menu option can be 'activated' with MBZ's software. I completely understand the fears pertaining to liability but am equally confused as my Wife's CLA-250 allows you to read the SMS/Text message while the vehicle is moving and its a year newer...
I'm about ready to pull the trigger on a brand new aftermarket HU that will allow sms reply's and much more completely hands free but the custom console (for R129) is going to be about $1,000 before the cost of the HU. I'm just waiting for the gentleman that builds the consoles to confirm the HU and console will fit my vehicle.
Tim