Samsung SPH-A640ZKAAFT - Manual (Page 164)

142 Section 3B: Trumpet Mobile Voice Kit
To reset Digit Dialing to the default settings:
1. Select Voice Kit .
2. At the “Say a command” voice prompt, select
Settings ( ) > Digit Dialing > Reset Digits .You are
prompted to reset digit adaptation.
3. Select OK .
Note: You can also access Voice Kit by selecting Menu >
Voice Kit > Voice Service .