Sim Card is not working in my device

As you'll see from this link --> How to unlock your iPhone for use with a different carrier - Apple Support

Only the carrier the phone is locked to, can remove the lock. You'll need to contact them directly and see if your phone qualifies for an unlock and what the requirement would be to unlock the phone.

No one here, including Apple can help you with this.

Ask your carrier for help.

Your device is carrier locked and you can only use their sim.