My iPhone 6 isn't making sounds all the time when I receive messages?

My iPhone 6 isn't making sounds all the time when I receive messages?

Added (1). I updated to iOS 9.02 and half the time it makes noise the other times it doesn't. Everything is on volume etc… Or is it something wrong with 9.02

Pray to Satan he will fix it

I'm not an expert and maybe you already tried it but you can go to settings then sound and then click on new mail

Turn the volume up!

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