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On your iphone Setting, network, cellular data network, in the setting did you input internet2.voicestream.com if you are on 9.99 plan, if you are on tzones 5.99 plan u need epc.tmobile.com.
check that setting, because after installing this setting you are suppose to get that error until you input the setting in your cellular data network. good luck and let me know howd you make out. if you are experiencing problems you can always remove it through cydia packages youll find it under T tzones hack. I hope you get your internet working. let me know what else i could help you with, i got the same error after installing the tzones hack put in cellular data network input internet2.voicestream.com for 9.99 plan and epc.tmobile.com for 5.99 data plan.