The message waiting lamp at the top-right corner of the phone can also be used to indicate when you have a call alerting your phone. The lamp is flashed to indicate a call waiting to be answered.
1.Press the MENU button.
2.Use the up and down arrow keys to locate the option Call Settings.... Press the Select soft key.
3.Use the up and down arrow keys to locate the option Visual Alerting.
4.Use the left and right arrow keys or press the On/Off soft key to change the setting.
5.When completed, press the Done soft key.
6.Press the Exit soft key to exit the menus.