Target wants to help older iPhone users upgrade to their new iPhone 4S, by trading it in of course. Target is offering consumers up to $200 for the iPhone 4 (making your new 4S free for the 16GB model), $150 for the iPhone 3G, and $100 for the iPhone 3G depending on its condition. In order to take advantage of this promo, you must sign a two-year contract with AT&T. Sucks if you are with another carrier and are happy with its service. Anyways this trade-in promo is kicks off today and ends on March 3rd so don’t take took long to take advantage of this.