1. Compare with a good one Simcard.
2. If the problem not solved clean simcard pin or simcard connector.
3. Replace Simcard connector if needed.
4. Check Flexible cable, replace flexible cable if needed.
5. If the problem not solved, resolder / rehot Asif Emif Simcard.
6. Replace Asif Emif Simcard If needed.
7. If the problem still not solved please trace simcard circuit if circuit broken.
