Samsung GH68-06534A - Manual (Page 185)

Phone settings
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Note: Not all SIM cards have a PIN2. If your SIM card
does not, this menu option is not displayed.
Auto redial
(Menu 9-5)
With the Auto redial function, the phone makes up
to ten attempts to redial a phone number after an
unsuccessful call.
Note: The interval between two call attempts varies.
The following options are available:
Off: the number is not redialled.
On: the number is redialled automatically.
Voiceclarity
(Menu 9-6)
This menu option makes a sound loud and clear.
It is useful when you are in a noisy place.
The following options are available:
Off: the phone does not turn on the voiceclaity.
On: the phone turns on the voiceclaity when you
are in a noisy place.