What you have just mentioned is using icloud to delete all my data when the go on line the next times. But as mentioned before that they have switched off the ipad and my concern is if they take out the SIM card. The data will still be there. Though I have the password XXXXX is only 4numbers. I wonder ipad has any limit to the number of try. If not, your answer doest solve my problem. Last times I thought when I registered my serial no. with apple, I thought they could do somethings for me if I lost my ipad. Can you help me with a better answet.