A statement from the carrier says that starting later this month, U.S. Cellular customers will have to sign a two-year contract when they purchase a subsidized phone. If a purchased phone is brought back within 15 days, customers will be charged a $35 restocking fee. While no precise date for the start of "dis-belief" was mentioned by U.S. Cellular, one report listed July 27th as a possibility. If that is the case, and you're a U.S. Cellular customer, better think about which phone will be your last subsidized purchase as a free-agent.
source: U.S.Cellular via Engadget