Samsung SCH-3500 - Manual (Page 40)

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Tone length setting.
The tone length setting enables you to select short or long
DTMF (dual-tone multi-frequency) tones. DTMF tones are
what is sent by your phone to access tele-services (such as
a bank account). The system used by the bank or other
service determines if you need short or long DTMF. If the
service is digital (which most are these days) short DTMF
will almost always work. However, some new systems and
almost all older (analog) systems require you to use long
DTMF tones.
To set tone length:
1. Press to display the Main Menu.
2. Press for Sounds.
3. Press for Tone Length.
4. Press the scroll keys to toggle between Short and Long.
5. When the desired option displays, press to save
the setting.
Alerts settings.
The alerts settings allow you to turn the Minute Beep and
Service Alert Tones on and off.
The Minute Beep sounds an alert 10 seconds before every
elapsed minute during an incoming or outgoing call, when
set.
Service alerts include audible alert tones that sound when:
The phone experiences a dropped call or a failed call.
The phone enters a new service area.