So, I remember reading a number of threads where folks have asked if there is a way to activate Siri on the iphone from the steering wheel, which there isn't. An alternative solution would be a remote way to activate Siri so your iphone can sit in the center console neatly tucked away; I just came across this device and thought I would share.

Satechi Bluetooth Multi-Media Remote Control for iPhone, iPad & All Bluetooth OS Devices

It has a home button which will allow you to activate Siri without touching the phone. Further, the company has stated a 6 month battery life, which is not bad. Not the most elegant solution (activating Siri from the steering wheel would be best), but it is a solution that will allow you to keep your phone tucked away.

Also doesn't look like a half bad product. I think I'll order one, and I'll update when I get it if I like it.