1. Compare with a good one Simcard.
2. If the problem not solved try Clean simcard pin and simcard connector.
3. Replaced Simcard connector if needed.
4. If the problem not solved resolder / rehot Asif Emif Simcard. (Simcard IC).
5. Replaced asif emif Simcard if needed.
6. If the problem still not solved please trace simcard circuit if broken circuit.

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