Hi, I recently purchased a iPad air with 4G on ebay, and it looks good. Yesterday I plugged in a new T-Mobile sim card trying to take advantage of their free 200MB data plan, but it didn't work, it just said no current data pass. So I went to a T-mobile store today and tried to figure it out. The store manager couldn't be much helpful and he asked me to call t-mobile for support. Long story short after being redirected multiple times I was told my Air's IMEI doesn't qualify for the free data plan and I should check my IMEI again with the seller. The IMEI I see in iOS is 3588XXX something, but the IMEI I see in iTunes is 0132XXXX something. I checked both on imei.info and they are not showing iPad Air. Is there a possibility that the IMEI was tampered? But why bother? Thanks, all this is quite frustrating for me.. ---------- BTW the seller told me it was a replacement unit from Apple, also it is with Sprint. I've just looked up online, could that be a problem?