how to activate in aboard?

You just got a white elephant

You cannot active it on AT&T.No AT&T coverage in Pakistan.

You also need a US credit card or Credit Voucher from AT&T to active the Sim.

   ..... Please guide me for any alternate way to unblock the Tab to use my Local GSM sim... Hope I'll convert my White Elephant to BLACK .. Thanks for your time & support. Regards, Syed

Pakistan....I think there should be some local mobile phone shops doing unlocking for you with a small price.

But in USA,it is illegal to do this now..