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Chander , i liked you because described well your problem. i think can advice better, look i think when your device fall down maybe is affected in external antena or internal antena of device which keep a network, so try to assembly and ressembly the device and look if external antena is not damaged, otherwise problem is with PA (circuit who control network) in this case you need you give some rapairer to make jump or change it, in this 2nd cenario it will cost you. i think this will help you.
Format the memory card using some other mobile or using computer. If then also it is not working then the memory card is damaged.
Also pls check whether the card u r using does not exceed the limit of the phone(I think it supports only 1GB external memory. If u r using a card having more memory than that, it will not be detected)
you can get the PUK from your service provider free of cost when you contact the customer care once you get the PUK code enter it in the phone when it requests for the code and can have the phone working again
sir W830i is java installed phone which means that it has a special code which do not allow other codes(virus) to get installed on it. so you dont need any anti virus for your phone if u need further assistance u can again contact me but pls this time contact me on my profile thankyou for using fixya dont forget to rate the solution