The Call Usage On A blackberry Curve Can Tell You A Lot About The Device. It Can Tell You How Long Your Last Call Was. It Can Also Tell You How Much Talking Has Been Done On The Phone Total. That's Useful If You're Buying A Used Blackberry Curve. Some mobile Carriers Won't Take A Return On A Phone If It's Been Used More Than A Certain Amount. The Caller Time Is One Way To Prove How Long You've Been Using It.

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