Is this for cellular data? Do you still have the little plastic card from which your sim came out of as this will have specific info for your sim. I recently changed carriers and was having trouble connecting, they were able to give me all my info from just accessing my name so get in contact with yours.
I've moved your thread to our Help Section where you will receive a better response.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.