Motorola Roadster 2
Bluetooth speaker: $100
How it works: This speaker lets you dial out using voice commands and announces incoming callers, giving you the option to pick up or decline.
The Roadster has an FM transmitter to route calls (or music from your phone) through the car speakers.
Android users can download an app that will read text messages aloud and send your dictated response.
NEXT: For nav-free cars