Iphone randomly deleted apps?

My iphone 3gs randomly deleted the camera, safari browser and app store. I haven't downloaded any new apps or changed any settings lately. How do I get them back?

Hmm.two options.
One, go to settings, then "restrictions"… I forgot where exactly but its in settings somwhere. Maybe somehow the restrictions for those apps turned on.

Second (probably the best): Reboot you iPhone by holding the sleep and home button for about 10 seconds. Don't let them go until the apple logo comes up and you should have them back.
hope it helps!

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