No...when it works, it works also when moving, by just pressing the voice recognition button on the steering wheel and saying "Phone" and then "Dial John Doe mobile". And also when it's not working it can be stopped. The system should work when moving or stopped...already verified this with Lexus. I'm going to try deleting the phone completely and adding it again...perhaps that will help. If not, I'll try adding the phone to one of the other three positions (you can have up to four phones) and see if that works.
I have the HTC Droid Incredible and it works very well in my 2010 RX350 built in July 2010. Maybe Lexus messed up the software for 2011. That's what happened with the IPOD gen5 nano...it worked in early model 2010's but doesn't work in my vehicle and they can't install the older version of software.