If you’ve upgraded your iPhone to iOS 7, there’s no need for third party flashlight apps anymore since one comes built right into Control Center. Here’s how to access it:
Turn your iPhone around and you should see the flash of your camera turned on. When you’re done using the flashlight, just repeat the same process above to turn it off again. That’s all there is to it! You can now free up some space on your iPhone by clearing out the flashlight apps you’ve had to download over the years.