Samsung SCH-8500 - Manual (Page 64)

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Your Sprint PCS Phone features Voice-activated dialing. When
on the Sprint PCS Nationwide Network, you can call up to 20
stored entries by speaking the name into the microphone.
Using the voice-activated dialing option requires that you first
program the phone to recognize the name of the person you
are calling.
Note: Voice-activated dialing does not work when your
phone is in analog mode .
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Avoid recording similar names phonetically. If you record
a similar name to one that is already stored in a voice-dial
memory, the phone requests another name.
Avoid recording in a noisy place.
Speak clearly and naturally.
Avoid very long or very short names. Names with two to
five syllables are recommended.
If a voice dial entry does not properly connect, you may
need to record the name and number again.