Time wasted, Returned the product, got delivery on 16th Dec performance and outlook is good but software issue is there. Deletable application error record folder is created automatically and occupies the space full around 7.89 GB because of that network drop occurs and shows no service. If and only if you clean the trash the network will be available otherwise no service.
Complaint placed in Flipkart and mobile technician came and checked and not able to solve the problem. So finally I returned it and they refunded my money.