How to make itunes forget my iphone?

I'm planning on upgrading my iphone but i need our laptop to 'forget' my current phone as i obviously won't be using it. Just wondering if their is a way for me to after i've loaded everything i want to keep like songs, apps, photos etc. Onto the laptop how i can clear my phone and make the laptop 'forget' my phone as a device? I have an apple macbook pro. Any suggestions would be ace!

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