the expenses that your friend will incur by trying to take legal action will outweigh any benefit of the outcome. The price difference is say about $100? Thats assuming the court rules in your favour( the burden of proof is on you guys to prove that he misrepresented the item and even if you were to prove that you wouldnt be able to prove that you didnt make a seperate deal on the side with a seperate phone) next time check your sht before you buy something plain and simple