How to re-sync my things back on my iphone after the update?

My phone wants to update so i'm gonna do it but i know its gonna delete everything so how do i put all my things on itunes?

No, if you are updating directly from your phone, it won't delete any files, that's only if you restore your phone. Just to be safe, though, backup your data on iTunes, then you can just resync. Backing up is easy, just plug in your phone, open iTunes, and press the sync button.

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