LG G7110 User Manual page 160

If enabled, you can receive a 2nd call during the call.
If you select Activate, you can accept a waiting (receiving) call.
If you select Cancel, you cannot recognize the waiting (receiving)
call.
Shows the status of Call waiting.
If you select , you can check the call duration by deep sound
every minute during a call.
: You can enter the voice dial mode whenever you
open the flip.
: You can enter the voice dial mode by holding down
* key.
When this function is activated, the phone will automatically try to
redial in the case of failure to connect a call.
Your phone will not make any attempts to redial when the original
call has not connected.
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