Sprint already has two smartphones operating on its 4G wireless service, but the only problem is that 4G is not as widespread as consumers would hope. Sprint is steadily rolling out 4G operations to as many cities as possible, but alas, the process is still painfully slow. Today, Sprint announced that 4G is now available in New York City, Hartford, New Haven, New Brunswick, Trenton and Tampa. In addition to using the HTC Evo 4G and Samsung Epic 4G to access to faster broadband service, you can also use the Overdrive 3G/4G Mobile Hotspot. Expect service in Los Angeles, San Francisco, Miami, Denver, Washington DC, and others by the end of the year.