General Samsung Galaxy Y-Duos MMI complete error mesaage

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http://androidforums.com – I am having Samsung Galaxy Y-Duos Lite GT-S5302 mobile. When i check for account balance, it gives USSD code running and after that MMI complete message is shown. No info of account balance is displayed. I am not able to make outgoing calls or receive incoming calls. Please help me to solve this issue. (General)