Sprint LTE iphone 5 is it free?

Is LTE a service for which we have to pay extra? I have an iPhone 5 and I'm currently with Sprint. I noticed LTE on top and I don't recall adding it to my plan. Is this something that just comes with it, or are they gonna charge me? I don't want any surprises on my bill so I would please like to be better informed on this LTE and how it all works.

LTE is included with your data plan.

4G LTE is the fastest signal available right now. It's faster then 3G.

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