Baltimore and Kansas City will have 4G LTE and upgraded 3G service by mid-2012, Sprint said today. Sprint already have announced plans to offer LTE services in Atlanta, Dallas, Houston and San Antonio by mid-2012. 

Sprint also announced the fourth quarter 2011 earnings today. The company reported total net subscriber additions of 1.6 million during the fourth quarter of 2011 – the best quarterly result in six years – bringing total ending subscribers to the highest level in the company’s history. Forty percent of Sprint’s 1.8 million iPhone sales in the fourth quarter were to new customers.

The company expects to bring approximately 12,000 sites on air by the end of 2012 and to complete the majority of its Network Vision roll-out in 2013. In addition, as part of Network Vision Sprint has announced it expects to begin launching 4G LTE by mid-year 2012.