Why won't my Iphone alert me when i get a text?

My phone, iphone 4s, always used to show me a banner whenever i get a text. It just randomly stopped. I checked in notifications about a million times and its set to show me a banner. I haven't dropped it or done anything that would have broken my phone. I would just really like to know how to fix this without taking it to an apple store.

Reset it!
1.press on power button continuously.
2. After 5 sec without releasing power button press on home button continuously.
3. After 10 sec release power button only (don't release home button)
now your iphone is reset. Don't be afraid. This won't delete your apps or personal records! Thats for default settings only! God bless you!

Make sure in notifications it has "show in home screen" selected

God Bless You

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