Will this screw up my service?

I have a old iphone 4. Well, i got a iphone 5 recently. My iphone 4 is still off. If i turn it on, and it has no like service like at&t or verizon, and the person i give it to used Wi-Fi, will it work? & will it mess with my service and bills?

Ok assuming your iPhone isn't locked and he can use the Internet by Wi-Fi, your bills will stay the same as you as you don't over you download limit, you don't have to worry about your service provider probably gives your unlimited or maybe 100gb a month so you all good

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