Question about Samsung SCH-u620 Cellular Phone

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I have a Samsung SCH-u620 that won't save my recent calls

I have a samsung u620. I've had it since last December. All of a sudden starting late last week, every time I power down my phone, I lose my entire recent calls list. I used to be able to tap the send key and see a list of calls that have come through my phone. I used that a lot for working with people that I would only be dealing with for a limited time and did not want to save to my phone book. To my knowledge I did not do anything to disable this feature, and I can't find anything in my phone to re-enable this so that the list does not clear every time I power down my phone. Can you help?

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MENU > SETTINGS AND TOOLS > PHONE SETTINGS > SECURITY > (Enter Your Password) (Default password is the last 4 digits of your phone number) > RESTORE DEFAULTS

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