My Nokia Lumia 900 does not ring while screen is locked, why ?

[Windows Central Question]

my nokia lumia 900 does not ring while scree locked, why ?

My mobile phone Nokia Lumia 900 does not ring while incoming call. please help me by answering this question. thanks

 

[jmshub]

Re: my nokia lumia 900 does not ring while scree locked, why ?

Does your screen light up and the phone vibrate, but just doesn't ring, or it makes no indication that a phone call is coming in?