IPhone 5 is not connecting to the internet?

I've got at iPhone 5. I've had it for about 1.5 years and so far it has been running perfectly fine. After updating it to iOS 8.0.2, the internet connection hasn't been working at all. I was using my sisters iPad and the internet connectivity was flawless. Help me please. I've already wasted 1.5 gb of cellular data. Also please don't give me a lecture about "iPhones are crap" or "Deal without internet"

Is your sister's Ipad on IOS 8? I recommend taking it to an apple store

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