I bought my iPad 2 thru AT&T and they put the sim card from my iPad 1 to my new iPad. That moved my current data plan to my new iPad (I'm grandfathered into the unlimited plan so I didn't want to lose it).
I second that iPhoNettie. I also have unlimited data plan. Were you aware people are selling their unlimited data plan sim card on Ebay for lots of money..
edit payment information link...then update the following two fields:
IMEI:
ICCID:
You get this info from the iPad (1 or 2) selct 'Settings' then 'General' then 'About'...
The IMEI and ICCID info is on that screen. No need to swap the SIM cards. This process outlined above transfers service instantly and does NOT change the plan type, billing, user info, or days remaining. Basically anytime an ATT customer wants to move a data plan the ATT iPad web page is all you need. No phone call!
Hello again! Worked great! Thanks a bunch.
And no thanks to the person who told me to call.
One, I'm was in no hurry, and two, got even a better answer.
Thanks, but I can't take the credit. Some nice person had posted it to the cult of mac website so I thought I'd pass it on. Glad it worked for everyone.