LG KE820 User Guide - Page 111
Security - security code
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Settings Send DTMF tones (Menu 9.6.7) You can send touch tones during an active call to control your voice mailbox or other automated phone services. C Information DTMF tone: Dual Tones Multiple Frequency Select line (SIM dependent) (Menu 9.6.8) This menu is shown only if the SIM supports two subscriber numbers, that is, two phone lines. Select which phone line (between Line 1 and Line 2) you want to use for making calls and sending short messages. Calls on both lines can be answered irrespective of the selected line. Security Menu 9.7 Settings PIN code request (Menu 9.7.1) In this menu, you can set the phone to ask for the PIN code of your SIM card when the phone is switched on. If this function is activated, you'll be requested to enter the PIN code. 1. Select PIN code request in the security settings menu, and then press [OK]. 2. Set Enable/Disable. 110