(n-72004)Error message on iphone 3gs

Hi there, recently changed network from 3 to 02 due to having poor signal.
Whilst I get better signal and with the 3G settings turned on and the logo showing at the top lefthand corner I get an error message (N-72004) to check my connectvity.
I have reset the network settings and fiddled around but with no luck. Wi-fi works no problems. My Model is iphone 3gs on iOS 5.1.1
Cheers hope someone can help

It worked, thanks.
For others reading this, there was nothing connected to the iPhone when the error message occured.

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