Iphone won't connect to 3G network

My iphone 4 was working not it suddenly has went and it won't connect to 3G and I can't try Wi-Fi just now, I'm getting full signal and phone calls to my number but for some reason it won't connect and I had a data plan I've tried resetting the setting and turning of air plane mode what can I do? Anyone else having problems in the UK?

There must be problem in your Wi-Fi hardware device. If you have prepaid plan you might just exceed the limit due to this you can't connect to 3G network. For this you need to check with your service provider. Try doing this

Step:1
Settings > General > Cellular>Makre sure Cellular Data is on - just in case it accidentally flipped off.

Step:2
Also try Settings > Airplane Mode>Toggle to On - wait a minute - toggle back off.

But if both the iPad and iPhone are having issues it is more than likely an issue with 3.

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