IPhone Dropped on very hard stone, now very laggy and crashes upon opening an app?

IPhone Dropped on very hard stone, now very laggy and crashes upon opening an app?
Okay, so i dropped my iPhone 4, onto a hard stone surface, no scratches or dints anywhere. But when I picked it up again it started lagging and apps will only open for about 5 seconds, then they would crash and go back to the home screen.

Any Help?

Reboot your iPhone. Hold the lock button and home button for fifteen seconds or so.

If that doesn't help, take it to Apple to see if they can see what happened internally.

I would recommend taking it into your local apple store and have them run a test on it and they might tell you that you might need to get a replacement phone if the tests come back positive for the possibility to crash completely so if i was you i would just get it replaced and with the new one make sure you buy a warranty for it ok

Restart your iPhone, I guess something is broken you need fix that http://iphone.pandaapp.com/

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