How much is the iPhone 4 worth these days?

I'm selling mine as I have just upgraded but I don't have a clue how much to sell it for? Can anyone help me please?

Since its 2 generations old, and you get them FREE with a new 2-year contract, its not worth much

A half of its price when you bought it.

Not much, check finished eBay auctions in your country, there's the market price.

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