Why doesn't my my 4g work on my iPhone 5?

I've had my phone for over 3 months now and it's always been perfectly fine until now. I try not to use up my data so I have it off most of the time. I turned it on and the 4g doesn't show up at the top left corner of my screen and it doesn't work when I try going in the safari. What's wrong with it?

I'm not sure what is wrong with it but I found the official Sprint website giving out directions for how to turn on 4G. Http://support.sprint.com/support/tutorial/Enable_or_Disable_4G_Connection_IPHONE_5_64GB/44049-665-3

IPhone 5c won't find Bluetooth

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