Check out u must have damaged the sim tray that's because you are not able to get network you can fixit easily its not a big deal

Frankly speaking you will not be able to do it on yor own as it requires some machines to do it and the amazon is giving the display is very expensive u will get the display around $200

First of all properly check if yor AirPods are properly connected or not. If it still dont work then switch off yor Bluetooth and then reboot yor device by pressing the lock button and the home button together not leaving it until the phone gets switched off and then switched on leave the buttons only when the apple logo appears then connect yor AirPods you will be able to connect.