Iphone not ringing in sleep mode

I hav a iphone 2g... which is creating a problem and i.e whenever it is on sleep mode or lock mode it does not show the incoming call... although the caller is callling and listenig to the ringing tone but it is not flashed on my phone... can it be get repaired. if yes... from where..? and for how much..? plz tell meeee

Take a back-up and restore it. That might work!!

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