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Though most major U.S. wireless carriers today tout the ubiquity of their third-generation, or 3G, wireless networks, they are simultaneously planning for the future, pushing the development of fourth-generation networks that they hope we'll all be using in a matter of years. Two of the best-known 4G technologies now on the horizon are WiMax, or Worldwide Interoperability for Microwave Access; and LTE, or Long Term Evolution. However, these two different technologies will likely take different paths in their development and eventually be used for different applications.
If you seen the sprint commercials on t.v you would know there the first carrier to come out with the 4G network so take that AT&T and Verizon.