Try to reboot your OPPO A12 phone. Remove the SIM card (s) and insert it/them again. If the problem persists, purchase a new SIM card. Check if there is any damage to the SIM card or SIM card holder. Go to Network Settings and check if the specified SIM is activated. If Airplane Mode is enabled by mistake, disable it. Dịch Vụ Hỗ Trợ Vay Tiền Nhanh 1s.

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