Why won't my cellular data work?

I have an iPhone 4 and iOS 7.0.2. When I turn on cellular data there isn't any 'E' symbol beside the signal bar, and 3G doesn't work either. Also, I'm not sure if it makes a difference but I live in Indonesia and my service provider is XL.

As long as you have mobile coverage then you should get cellular data without any troubles. Also if Egde (E) doesn't work it means that 3G will definitely not work. Data always reverts to E if 3G is not available

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