ok heres the thing, im about to add another line to my att account so i will be eligible for an iphone at the price of the 2 year agreement, i have an extra phone that i could use that hasnt been used yet and is completely new, i looked on ebay to see how much a 3g iphone goes for and i saw a 16g one that went for 700+. so im thinking about getting the 16g for 299 then selling it on ebay for profit, but im confused on the whole contract thing, im not gonna cancel my contract or anything, im gonna use my other phone for that line, but dont you have to sign up for a special iphone contract or something? or is it just the unlimited data plan? and if it is just the unlimited data plan, i can just cancel it after the first month right? so is it safe to sell the iphone without breaking any contracts or anything?