Argument help! Please someone

My friend gave me his old iPhone 4.It had a cracked screen and was in bad condition. I had the phone for about 3 days and then the phone didn't work. My friend then says his dad wanted the phone back so they could sell it, But because the phone didn't work he is charging me to pay for the fixtures! I have no idea how the phone is not working I never dropped it or took it out in the rain and yet he is charging me for the fixtures. It had a cracked screen anyway! This guy is had to win an argument against so please help!

Tell your friend's dad the truth. It didn't even work when you first got it, why should you be forced to pay for it?

If he GAVE it to you, then its yours. If he wants it back, HE should pay you for it.

He gave it to you therefore it's yours…
Don't pay for it, it did have a cracked screen which wasn't your fault

Tell him that it was already broken and it wasn't your fault, if he still says no, say that if you have to fix it then you get to sell it and then take the phone. Or simply split the price. Or just don't pay it.