Hi there, Can anyone please tell me how I can get my missing 'Cellular Data Info' tab back, which can be found in Settings, General, Network.

To explain, normally my service is with Vodafone but currently I am working in an area where there is zero Vodafone reception. So for the two weeks I am working there, I decided to purchase a Telecom NZ pre-paid sim card.
When I insert my new sim card into my iPhone 4 (ios5.0) the cellular data info tab dissapears. Without that tab I am not able to put any APN settings in and as a result the new sim is useless.

I believe there is work-around for this problem. Does anyone have any suggestions,