If I download iOS 7 Beta to my iPhone 4, will my stuff get deleted?

Hi, I was considering downloading and installing the iOS 7 Beta to my iPhone 4, but I'm not sure if I should because I don't know if my stuff (contacts, pictures, apps,… Etc) would get deleted. I will switch to iOS 7 if I can keep my stuff, so can I?

Without a dev account your iphone will be disabled on or before july 22nd when the beta 2 is released.

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