Why can't SIM connect to the network on the Microsoft Lumia 640 XL?

My Microsoft Lumia 640XL suddenly stopped connecting to the network from yesterday Morning.

In Settings->mobile+SIM section, I can see SIM1 as Airtel. This means SIM is getting detected but 

probably not camping to the network. I've tried inserting the SIM in the secondary SIM slot also,

but there also same issue-can't connect to the network.

Please help in solving this issue.




Hi Ramesh. Can you try using the SIM with other phones? Was the phone working with Airtel's network before?



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