From their website at http://labs.google.com/goog411/#utm_source=en-us-gmwc=et=gmwc:
Dial from any phone 1-800-GOOG-411(1-800-466-4411)
Using this service, you can:
- search for a local business by name or category. You can say "Giovanni's Pizzeria" or just "pizza".
- get connected to the business, free of charge.
- get the details by SMS if you’re using a mobile phone.Just say "text message".
And it's free. Google doesn’t charge you a thing for the call or for connecting you to the business. Regular phone charges may apply, based on your telephone service provider.
Note: Google Voice Local Search is still in its experimental stage. It may not be available at all times and may not work for all users. We’re fine-tuning the service to get better at recognizing your requests. It’s currently only available in English, in the US, for US business listings.