I have an Apple iPhone 4 and with the iOS 4.1 which is nothing but the operating system and using it from last few months and it is serving me the best, but from last few days i am not able solve one problem that is nothing but as when my phone goes to the sleep mode then my mobile phones screen goes off that is it of no use for few minutes and as soon as i press the unlock button to unlock the phone then there is the two to three seconds pause and then the screen shows light, I don't know whether this is the problem and if it is a problem than how to solve it.
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