1. Visit an authorized A1 Croatia retail location or contact their customer support to request a replacement SIM card. 2. Ensure that the new SIM card is provisioned with the latest IMS profile compatible with modern Fairphone modem hardware. 3. Power off the Fairphone 6. 4. Remove the existing SIM card and insert the new replacement card into the SIM tray. 5. Power on the device and allow it to auto-configure network settings. 6. Verify the fix by confirming that incoming calls now display the caller ID while 4G Calling is enabled.
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