LG G1500 User Manual page 62

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If you want to use the handsfree portable (earphone),
Please press the button for a long time after inserting it to
the connector when incoming a call.
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.
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