Will all my files be erased when I install the official iOS7?

As y'all know, the official event is being held right now where the iPhone 5S, 5C and iOS7 are officially going to be released. However, I was wondering if all my apps and files will be deleted and act like a fresh OS once I install it.

As long as you go through iTunes, you won't lose a thing. I always create a back-up by syncing my iPhone first, though. I've never needed it.

iOS will not be released to the public until September 18th.

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