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Pavani Sharma, according to your explanation, there is two possibility of problem :1st hardware problem all keypad had a water damage that why it is not working you need to clean main board with alcohol and let it dry for 2 hours, if you don't know how to do it show some official repairer.2nd Software problem maybe your keypad is working properly without sim or with sim but is is freezing after some time. for this you need to do hard reset, for he hard rest first switch off device and then press and hold * 3 and green button and then power on wait until shows insert sim, if software problem persist then show some official repairer to fix for you.
Hello, how r u Dear? i think u r fine. Dear your problem is very serious. it has two solution (1) reinstall the software in your mobile then check i think its clear. if it does not work then go to the hardware shope and clean its keypad chip.
This is because Keypad is not functioning,the solution is to go to your nearest service centre and repair your Keypad.The Service centre contact number and address will be provided by your service provider.