Why won't my mobile data work?

I have 1GB of internet data on my iPhone and on the MyEE app it says it's all still available but when I try and use it it won't work. Wi-Fi works on my phone and the cellular data or whatever it is called is turned on. I've tried turning that on and off and also turning my phone on and off but this hasn't worked. I have never had this problem before, it used to work fine. It's really frustrating so does anyone know how to fix this?

I wish I did… Try going to to your carrier's store and asking them in person.

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