I already have an iPhone 3GS and my girlfriend has a phone that she is fine with. I am on a family plan with my family and she is on a plan by herself. What I am going to do is leave my family plan since my contract is up, and get an iPhone from apple and sign a 2 year contract and create a family plan with my girlfriend. When I do this, I will have 2 iPhone 3GS'. My girlfriend doesn't want the iPhone so I plan on selling it on eBay. My question is what iPhone 3GS should I get? Which one is worth most on eBay? Should I buy it and keep it sealed in the box or should I open the box and unlock and jailbreak it and add a load of apps? Which will offer me the most profit? 16gb or the 32gb? That's basically my question. I know regardless I'd make around $400 profit, but I just want to max the profit I'd make cuz eBay and paypal takes a load of fees.