This solution picture below shows the connection line paths of the SIM card pin connector which tells us where and what components on the PCB board needs to check.
Samsung GT-C3322 Sim Card jumper ways
Samsung GT-C3322 Insert Sim Solution
Samsung C3322 Sim Card Connecter Pin Ways Jumper
Samsung GT-C3322 sim Not Accept Problem Working Solution
Repair Samsung C3322 Sim Problem
Samsung C3322 insert sim card problem repair hints:
1. Ensure that the SIM card you are using is 100% working.
2. Clean the SIM card slot pin connectors.
3. Check and trace the SIM card supply voltage.
5. Trace the SIM Reset pin and Ground pin connections.