Why won't my iMessage notification work on my iphone 4?

So i got a free iphone 4 from my work and it is all up to date. IOS 7, the newest version. Whenever I text to someone, the iphone won't notify me if someone texted, even though i went to setting and turned on everything. The notification works for snapchat and a couple of other apps…

Here is what i did setting>notification center>Messages> alert style: Banner> everything else is switched on…> Show alerts from everyone

Have you tried doing a hard reset on the phone? Not restore, reset.

Home and power button held down at the same time till the apple logo appears

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