Samsung SCH-A890

I'm interested in getting this phone when my I'm up for my NE2 in a couple months. I was wondering how the voice commands work being that there is no speaker phone on this handset. I have a couple questions and any answers would be greatly appreciated:

Can I talk to the phone when I press the voice commands key?

Do I have to put the phone to my ear after speaking the voice commands to the phone or does the phone some how keep it on speaker phone or something like that because I know there is no speaker phone on this phone?

Will the voice commands work with a regular headset plugged in while I am driving?

If anyone knows this: Are the voice commands better on this phone or the N330? I know both phones have the voice command feature and they both have different commands that can be spoken to the phone. I already know the N330 has a speaker phone and I could always put it on speaker phone after I do my voice commands.

Again, thank you. Any help would be appreciated.

David

PS - If it would be at all possible not to compare the voice commands to the voice commands on LG phones. I have not had any luck with LG phones and have no desire to get one.