T-Mobile allow GSM phone-enabled tablets to get phone plans, not data plans!
T-Mobile: Given that a phone-enabled tablet (such as my Sony Z3 Tablet Compact LTE SPG621) would not use any more data than any smartphone would, why do you not allow them to have phone plans? These devices exist because there is a demand for them worldwide. And they sell because carriers in other countries understand consumers want this function. It is a simple matter of adding the IMEI of phone-enabled tablets to the list of approved devices. This petition I hope will show just how many people agree with me.