Showing Sim card does not allow connection to this network on moto g6 Indian version

I have a new moto g6(a week old). Suddenly my sim card had no signal and when I tried to get the signal back its showing ' sim card does not allow connection to this network'. When I put it in my moto g3 it's working fine. Any solution for this?
Device - Moto g6 Indian variant and sim carrier is IND AIRTEL

I have a new moto g6(a week old). Suddenly my sim card had no signal and when I tried to get the signal back its showing ' sim card does not allow connection to this network'. When I put it in my moto g3 it's working fine. Any solution for this?
Device - Moto g6 Indian variant and sim carrier is IND AIRTEL

Note that asking once is enough.

Have you spoken to your carrier about it?

Bring the phone into IND AIRTEL and ask them to please get it working for you. (Some carriers are funny - when you change the SIM card to another phone, it messes up the account settings.)