IPhone 4 won't give me notifications when I'm using it?

I've had my phone for about a month. About 2 days ago it stopped showing the banner at the top of the screen when I got a text or any type of notification. None of my settings have been changed and it's still set to the banner but it won't show up. Does anyone know why or how to fix it?

Why do you want notifications? There scam to hack your phone I keep getting those

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