[citation][nom]jtt283[/nom]The issue here isn't that the phone is locked, or exclusive to AT&T. The issue is that the contract is unclear. You want an iPhone, so you get a 2-year contract, planning to change to another carrier after that if the service sucks, or someone else is better/cheaper; only to discover that you can't, because of the exclusivity, which isn't described in your contract. You think it's for two years, but no, it's essentially for at least five years (if not for life) if you want to use that phone.[/citation]
Any smart person would know that when you buy a locked phone you're agreeing to exclusively use it with the carrier you bought it from. Legally in the USA a phone manufacturer has the right to permanently tie a phone to a specific carrier for as long as they want without telling you. AT&T can legally tell you that you can never, ever use that free flip phone on any other network. In most (if not all) countries that have both GSM and 2G CDMA carriers it's also legal for a phone manufacturer to make a high end smartphone running Android or Windows or any other OS that will only work on a GSM network, for example, in effect telling you that you can't take the phone to a competing CDMA carrier.