Sprint announced today that it has introduced 70 new 4G LTE markets. The new markets include Birmingham, Green Bay, Orlando, San Diego, St. Louis, and the U.S. Virgin Islands, among others. Sprint now offers 4G LTE in 300 U.S. markets. Verizon currently claims its 4G LTE network is available in more than 500 markets, while AT&T’s 4G LTE network includes 476 markets.