Motorola C331 - Manual (Page 60)

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Menu Feature Descriptions
Contrast Adjust the contrast setting
for your display.
DTMF Your phone can send a
number to the network as
dual tone multi-frequency
(DTMF) tones. DTMF tones
are used to communicate
with automated systems
that require you to enter a
number such as a code,
password, or credit card
number. Use this option to
set DTMF tones long, short,
or off.
Master Reset Reset all options back to
their original factory settings
except for the unlock code,
security code, and lifetime
timer.