Iphone cracked, touch not working, can't unlock - how to back up?

My iPhone cracked today, and the the screen's gone completely white. The phone still works (ie it still charges, rings, etc), but the touch isn't working and I can't see the screen at all.
I'm trying to back everything up onto my computer so that I don't lose all of my photos, etc… But I can't, because iTunes tells me I need to unlock my iPhone first.

Did you have iCloud enabled?

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