There is a strange coin sound on the mobile phone.

I suggest you: 1. Turn the machine on and off and try again.

2. Drop down the top curtain menu to see if there are unread messages.

3. Check whether the alarm clock or calendar has a setting reminder.

3. Back up mobile phone data (phone book, SMS, multimedia files, etc.). ), restore the factory settings or send the mobile phone to the nearest service center for testing and further processing.