Optus X SLEEK User Manual page 98

I don't hear when somebody calls/message me, I just see missed calls/
messages notifications on display.
• Please check if Interruptions/Do not disturb mode is activated on your
device. If it is activated you can see a "Star"
OS 5.X version) or
notification panel. In this case you need deactivate Interruptions/Do
not disturb mode. To do it just press volume up or down key and select
"All" (on Android 5.X) or modify it in Settings Sound & notifications
Interruptions (for Android 5.X) or Do not disturb (for Android 6.X).
My device asks me to enter some password/code/key that I don't
remember or don't know due to this device has been used by another
person before and I can't get this password/code/key from him/her.
• Password/code/key request could be caused by same security feature
activated on this device. You can try to perform Factory data reset,
but remember that if it doesn't help you need to apply authorized
repair center and it will not be regarded as warranty case.
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symbol (for Android