US number-three Sprint has extended its LTE network to four more cities as it adds to the 15 markets where it launched the 4G service in July. The cities to have gained LTE connectivity are Baltimore in Maryland, Gainesville (Georgia), Manhattan/Junction City (Kansas) and Sedalia (Missouri). In addition, the company’s upgraded 3G network, which is part of the Network Vision initiative, has gone live in Baltimore, Boston and Washington DC.