alarm doesnt ring when my ph is off

[Deba10]

Why does my phone alarm not ring when my phone is switched off??

Is there something missing?

Im using m30s 

[Rahulshro]

It's available in all Chinese mobiles that even if the mobile is switched off then also the Alarm rings

[Adityaroar79]

We paying thousands but a single essential feature lacks in samsung device (a21s) ruins the trust and made focus one others