You can chop a T-mobile sim in half and use it with the iPad, though you'll be limited to EDGE 2g speeds. edit- I believe T-mobile may also sell micro-sim card

You can chop a T-mobile sim in half and use it with the iPad, though you'll be limited to EDGE 2g speeds. edit- I believe T-mobile may also sell micro-sim cards. Shouldn't be necessary, though, as you can also get a micro-to-regular sized SIM adapter for your modified micro. This is a great reason to sign up for the unlimited iPad plan now, and hold on to it; the micro-sim works in any device with the help of an adapter.