What happens if i reset my iphone?

I'm giving my old iphone 3gs to someone else and i need to take everything off of it. All my music and apps are saved onto my itunes on my computer. Will everything disappear off of my itunes if i reset my phone? I'm scared that everything's gonna get deleted!

As long as you sync everything to your ITunes account you'll be fine. Reset will only reset the phone itself and not you're whole account.

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