Buying a new smartphone shouldn't be a major expense. In fact, it shouldn't be an expense at all. Our dealnews archives show that months after a phone's release, you can snag that same handset for free (contract and data plans required). But which smartphones hit the $0 mark the fastest, and is it ever possible to get an iPhone for free? We tracked past deals on popular handsets to predict how long before some of today's hottest models are handed out for free.