iPad 1 WIFI+GSM is not possible the activation

Hi, I have a iPad 1 64GB Wifi + 3G, I restore it at iOS 5.1.1 but when I selected the language it show me "Activation in progress ... " and after "The activation isnt possible, try more later" but I never can activated mi iPad.

I take for two weeks.

How I can make for solved it ??

Thanks.