Why is my phone not connecting to cellular network?

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I put my new Fizz sim card in my phone (iPhone 6) yesterday and almost instantaneously had the fizz network running. I can make phone calls and receive text messages. However, I do not have internet access when I am not connected to wifi. It says that I am connected on LTE or 3G at the top of the screen but every time I try to open my emails or a website it says that I am not connected to the internet.

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