LG G1500 Guide De L'utilisateur page 142

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If you select this, you can send your phone number to the other
party. That is, your phone number will be displayed on receiver's
phone.
If you select this, you can't send your phone number.
If you select this menu, this phone will be set to the default value.
If this service is available, you can accept a waiting (incoming) call.
Activating the corresponding service.
Deactivating the corresponding service.
Checking the Status of the service.
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.
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