The accuracy of my voice dialing is awful. My i4 gets about 1 out 10 correct. I remember my 3gs would get them all correct no problem. Anyone having this issue with their i4? Try it out and see what happens....
Hold you finger down on the home button until the voice feature is activated. Then say call Chuck and it will dial your number. If you have multiple numbers for example Home and Mobile. It will say Calling Chuck: Home or Mobile, then you say Mobile and it auto dials your mobile number.