I have an iPhone 4 that I can now get unlocked with AT&T because I completed the contract. My friend wants a smartphone, but is unsure if he can afford the monthly bill. If I give him my iPhone 4, what would be the best way for him to use it, but have a cheap bill. I'm assuming he can do this off contract. Any help? I know he can get a free iPhone with some contracts, but the advantage in me giving him this phone is that maybe he can be off contract and have a smaller data plan.