Will my Contacts, pictures, apps get deleted if I upgrade iOS 9?

I'm trying to delete stuff to have more space so my phone can get backed up. I have an iPhone 6 but it doesn't have a computer connected to it. I don't want to have it say that I have to connect my phone to iTunes when IIm updating. So will my stuff get deleted? Even if it's backed up on iCloud?

It shouldn't.

No it wouldn't get deleted but no harm in doing a backup before starting the update.

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