Why can't I hook up to mobile data from my Apple iPhone 5?

I can connect to regular wifi but my iphone 5 will not connect to mobile data. I have disabled data, waited 24 hours, shut down the iphone then enabled data and restart phone but still doesn't work, 




Hi Terry. Which carrier are you with? Did you check your balance if you still have enough data?



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Are you on the best cell phone plan?