[monaP]

Hi there I have a blackberry curve 9300 what seems to be the problem is that when I try making phone calls its says no service currently avaliable and when I want to check my airtime it says supplementary error general error then I have to put my sim in a other phone to check my airtime balance when I put the sim in again then it works for a hour or so then it does the same thing again this is a second hand phone can u please help me
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