When I first got my Zed I drove it my my mates house. He was asking about the buttons on the steering wheel, I shouted dial number, Yeoms (his nickname) is a fanny, it then said dialing and it started ringing!
The phone book was wiped and I've never really bothered since. One of these days I'll set it up.
Do it while parked and speak quietly, it seems to make it easier!