I just got my LTE 12.9" iPad Pro second generation yesterday and I tried to sign up for the T-Mobile promotional plan that includes 5GB of data for use over 150 days for a mere $10. Unfortunately every time I try to sign up for it using the embedded Apple SIM and the built in sign-up wizard within the Settings > Cellular section the process fails and asks me to call customer care. I tried calling customer care and they keep asking for an ICCID which I believe one would only have if they had a physical SIM card. From what I can tell the CSN number serves the same purpose for the embedded SIM as the ICCID would for a physical SIM card. Has anyone else had any luck signing up for this plan on their new LTE iPad Pro with the embedded Apple SIM? I feel like I'm going to have to end up getting a physical SIM card to get things working. Let me know if you've had any luck signing up for this plan!