Back to the topic why this mobile sim is not working some thing because it's SIM IC problem. If your sim is not working then it's no problem here is the circuit solutions on how you can turn your sim on by simply doing some IC Jumper work. Here is the demo on how to repair nokia 1202 Sim not working fault. or Nokia 1202 sim IC Jumper.
Nokia 1202 SIM IC Jumper Connection Image Demo
Tag: sim not working, Sim Problem, Nokia 1202 sim