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You can make a call without sending your own number (caller identification). Follow these instructions to turn your own caller identification on or off.
Find "Caller ID"
Press the menu icon.
Press Additional settings.
Press Caller ID.
Turn your own caller identification on or off
Press Hide number or Show number.
Please note: you can only hide your caller identification for voice calls. When you send text messages, your phone number is always displayed.
Press the Home key to return to standby mode.