COMING UP: CBS4 Investigates Inside Denver's Underground, Tonight on CBS4 at 10 (Watch Preview)
4G In Denver Among The BestAsk anyone how their cellphone works and you'll probably get an earful. Cell companies are constantly working on improving networks, but there are still gaps. And now they're touting new 4G service. So CBS4's Alan Gionet wondered, what is 4G?

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