Samsung GSM1800 - Manual (Page 105)

Sound Settings
105
SMS-CB Tone (Menu 5.5.2)
The following options are available for alerting you
to new cell broadcast (CB) messages:
Off: the phone does not use a CB tone.
Vibration: the phone vibrates.
Single Beep: the phone beeps once.
SMS-CB Tone x: the phone uses one of several CB
tones.
MMS Tone (Menu 5.5.3)
The following options are available for alerting you
to new MMS messages:
Off: the phone does not use an MMS tone.
Vibration: the phone vibrates.
Single Beep: the phone beeps once.
MMS Tone x: the phone uses one of several MMS
tones.
AutoFolder Tone
(Menu 5.6)
This menu allows you to select the tone that the
phone sounds when you open or close the folder
using the Auto Folder key.
To turn the sound off, select Off.