3G isn't working on iphone 5?

I've had my iPhone 5 for a while now so it isn't the phone that's messed up but suddenly my 3G has stopped working. It's updated to 7.0.4 and when I turn my 3G on it says 'Network Error'. My wi-fi works perfectly so it can't be anything to do with that?
Many times I have put credit on my phone, which I use to pay for internet and right now I still have 500mb to use up but I can't use it as my 3G doesn't work!
I've tried resetting statistics, rebooting my phone, resetting network settings. Ugh, what do I do!

This sounds like a problem with the network you're on, and not a problem with your phone. 3G has nothing to do with Wi-Fi, two completely different wireless technologies.

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