Iphone 4s is not showing me notifications

For some reason my Iphone 4s is not showing me any notifications. I have all the notifications turned on but it won't show on my lock screen. For example. In order for me to see my mail, I have to click on my Mail app, and then it loads my emails. When i go on twitter, instagram, Facebook, etc. I have notifications there but my iphone doesn't let me know i had any. I tried everything, from deleting the app and re installing it, to resetting my iphone to its original settings, and nothing is working.

Make sure you don't have do not disturb turned on. Other than that I can't think of a reason other than faulty merchandise

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