Sim not supported

It says “SIM Not Supported

The SIM card that you currently have installed in this iPhone is

from a service provider that is not supported under the

activation policy that is currently assigned by the activation

server. This is not a hardware issue with the iPhone. Please

insert another SIM card from a supported service provider or

request that this iPhone be unlocked by your service provider.

Please contact Apple for more information.

Try Again”. So Guys how I can repair this thing ?🙏🙏🙏🙏🙏