Why is my iPhone 5 saying I either have 3G or LTE?

I bought the iPhone 5(: I know it's a 4G phone, but why does it either say 3G or just LTE at the top? I don't get it? Occasionally it will have 4G LTE but not in the last few days…

Because apple sucks. Nah just kidding.

The internet speeds your phone is Picking up
either LTE or 3G

Depends what your carrier has in that area, you might not have LTE in that area.

LTE is 4G, but not available in all areas.

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