Airtel sim in USA - No Service or Emergency call only

I am leaving in Jersey City (zip code : 07306) since December 26th 2019, I am using my India Airtel number which was working fine using AT&T network, but suddenly 2-3 days before it was not able to connect to any network, it is showing as Emergency calls only, I tried the sim card in another Mobile phone as well but it is not working in that device as well.

Can you please help me on this.
My Airtel Number : +91 9887594812
My local number: +1 2012383021