During A Call - LG G3100 User Manual

If this service is Enable, you can accept a waiting (incoming) call.
Activating the corresponding service.
Deactivating the corresponding service.
Checking the Status of the service.
If you select
every minute during a call.
When this function is set on, your phone will make up to 10
attempts for a call after not connecting.
Your phone will not make any attempts to connect the call after not
connecting.
you can check the call duration by beep sound
47