Can I turn in my iPhone with iOS7 or do I have to downgrade it?

I'm turning in my iPhone 4S but it has iOS7 on it, do I need to downgrade it before turning it in? I'm turning it in to get a samsung galaxy 4.

They may just wonder why you have it on there. If you downloaded iOS7 illegally, and not as a developer then it may just be embarrassing if the employees find out. I would just wipe the phone and downgrade it. MAKE SURE YOU BACK UP All YOUR INFORMATION.

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