I discovered that with the 200 MB free data plan if you put the SIM card in a different ipad it stops working. Takes you to the my tmobile website and claims that your bucket of data has expired. Customer care is clueless. Tried 3 times and I just get transferred around. Anyone else have similar experience? The loop hole for now is to cancel your account and deactivate from scratch in the new ipad. But eventually when tmobile decides no more free data (yes, it can happen at any time being that they're saying this is a promotional offer), we will be screwed when we get a new ipad or decide to put the sim in another tablet.