Can I buy a Verizon iPhone and deactivate it?

I'm opening a new line on a Verizon family plan. I intend to buy and activate a new iPhone 5 on that new line since it will only cost me $200. But I have an inactive Verizon iPhone 4 at home that I would like to use in place of the iPhone 5.Is it possible to purchase the iPhone 5, deactivate it and activate the iPhone 4 on the new line that I purchased the iPhone 5 with? If it is possible, is there any charge or negative repercussions of doing this?

Hi here's my a.swer to you abt your Iphone.4 or 5, this what i'm going to say. To You can Buy and Activate why not even where ever u brought it YES?

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