How do i voice dial

On previous phones i could voice dial whilst i am driving. i am not sure how to do it on the nexus 4 or if it is supported.

I try tapping on the google microphone and saying "Dial Darren"... sometimes in comes up with a search Dial Dar Ren or dials some pizza number or just searches for Darren on the web.

I thought i could say dial or call and the name of a person and the nexus would look into my contacts and dial that person. Seems to be not able to do it. On the very old Nokia's you could attach a voice to a contact and it would find that contact easier but i cannot even find such an option on the nexus.

Any help...?

Try Utter from the play store.

the correct syntax is "Call Andy Rubin"

If you have a valid phone number for Andy Rubin in your phone book it will dial it. If you have multiple phone numbers say "Call Andy Rubin Mobile"

Doesn't work 100% of the time for me, but is reasonably accurate.