I am having the no voice command for the iphone 4S (manual entry or dialing will work, though).
No other issues that I am aware of (my wife's Jeep - 2011 Summit)
Dealer is telling me it is the 4S, and that they are waiting for an update from Chrysler. In the meantime, they have unpaired the 4S, and that all voice commands work.
I would rather have phone capability and no voice command until the software update is available. I plan to re-pair 4S tonight.
Frustrating that the 4S has been out for 8 months w/o an update...