IPhone 4s lock screen problems?

I've only had my iPhone 4s about three weeks now and whenever I get a text or a phone call, the lock screen doesn't show it any more, like I miss calls because it doesn't show. I was just wondering if anyone knew how to fix this?

Have you tried resetting your phone (hold down sleep & home button)? If not, try searching the Apple web forums or visit a local Apple store.

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