As part of its wider 4G LTE roll out, US operator Sprint announced Monday that it has begun building its network infrastructure in more than 100 new cities within its existing 3G areas, with around fifteen of its most popular areas set to see upgraded connectivity in the coming months. Sprint says that some of the major city areas that will see 4G LTE first will be Boston, Charlotte, N.C., Chicago, Indianapolis, LA, Memphis, Miami, Nashville, New Orleans, New York, Philadelphia and Washington, D.C. This adds to the 19 cities which it has already pushed its 4G services live, which includes a wide area of Georgia, Kansas City and some parts of Texas. Read the full story at The Next Web.