The Voice Dial application in HTC Hero for Sprint isn't very useful if you are expecting hands-free using of the phone. The voice dial program included has a long delay if you aren't close to the actual name or description used (such as CALL BOB SMITH takes about 30secs where CALL BOB SMITH AT HOME takes about 3 secs as the number is stored in Bob's home # field). Along with this, even if the phone returns 1 choice, you still have that long wait time.
Otherwise, voice dial is good (when you are NOT driving)
now for driving purposes ....
voice dial sucks. You have to take your eyes off the road to (1. find the voice dial button to press, 2. select the already correct or many #s to dial, and 3. if you have pwd-protected phone, you might as well crash or pull over).
voice dial does NOT work when you are trying to dial out with bluetooth, but once the phone makes the call, you can talk through the bluetooth earpiece.
Also, if you answer an incoming call and
1. click the phone to answer ... your phone will answer, not your bluetooth
2. click the bluetooth to answer, the bluetooth will answer, not the phone
Last thing, I have a friend at work that says that he can do hands-free with his HTC Hero in his car because he has a built-in bluetooth hands-free device that came from the dealer. So if you have that, check with your dealer and see if you can get the phone connected... at least you won't crash in your own car.
Even though I prefer the ear piece (and SO much easier for me than letting everyone in the car hear the conversation), I did find at Wal-Mart a bluetooth car hands-free system that looked reasonable for using.. it (with others) was located next to the auto car speakers section.
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I think the Android developers were hoping one of "us" would program the bluetooth voice dialing, but then again it seems the actual programming commands to access the bluetooth stack are not available in the current sdk ... maybe again, they probably didn't have a good programmer to get the bluetooth working right (which may be the reason for the voice dial app) ... just my silly opinion.

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although i don't think it likes my accent... no pre-recoding required

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