Hello Sureewal, Thank you for contacting Apple Channel Support, I request you to restore the iPhone on different unit and check how this works. Also we request you to refer the article "OP1540". Thank you, Infant J. | Apple Care APAC Apple Care channel Support Specialist Note: If you would like to send us a reply, please ensure the "Status" field is selected as "Open" and "Escalate To" field is selected as "Apple”. If you feel your issue is now resolved, please ensure the “Status” field is selected as “Closed”