Don't know about the new iPad, but the last one could not use 3G from T-mobile due to it not having the correct frequency. Don't know if this has been fixed or not.
If the issue with T-Mobile was simply a matter of incompatible radio frequency, that has nothing to do with unlock. That's a modem issue.
OP: check the frequencies used by ipad. Compare them to your carrier. If they're compatible, then you should be fine.
Don't know about the new iPad, but the last one could not use 3G from T-mobile due to it not having the correct frequency. Don't know if this has been fixed or not.
Don't know about the new iPad, but the last one could not use 3G from T-mobile due to it not having the correct frequency. Don't know if this has been fixed or not.