2. Check SIM Card and Tray Ensure the SIM card is properly seated in its slot: Turn off your iPhone and remove the SIM card. Check the SIM card for any visible damage.

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A SIM card that is damaged or isn't set properly in the tray can cause network errors. With your phone off, carefully remove your phone's SIM card and check it for damage.

You can check if your device is locked through the IMEI information, or by switching out the SIM card, or by checking via the device's mobile settings.