TS2802: iPhone: Hardware troubleshootingLearn about iPhone: Hardware troubleshooting
Currently Being ModeratedJan 14, 2013 9:04 PM (in response to Tommyfresh)
You must set the Cellular Data according (Settings>>General>>Cellular>>Cellular Data). Contact your carrier for further information.
Turn on Cellular Data, Roaming and 3G as well, even your carrier doesn't have 3G available.
Hope it will be helpful