Sprint today confirmed that is is planning to change its exchange policies. First, it has shortened the 30-day return policy down to 14 days. Sprint said this applies to new lines of service, accessories, and upgrades. This mirrors changes made by some of Sprint's competitors, such as Verizon Wireless. New Sprint customers will now have two weeks to test their new phone and service. After the 14-day period expires, they will be locked into their contract and can't return the device without incurring penalties. Second, Sprint has dropped its "Free Guarantee" program. This program offered customers the ability to try Sprint with no risk of being charged during their trial. Now customers will have to pay for the service they use. These changes go into effect September 16.