I'm curious as well. I sold my phone already, so I had to sign in to my sons phone to use the app for ordering in the morning. My line is eligible for the upgrade. The problems is that because it is his phone I am signed into, his phone number is showing in the app on the preorder I have saved in favorites and I am afraid it is going to say I can't upgrade his line because I just got him an XR. I hope it then will let me select my line.