Ok. So this is what happened to me and wanted to share with you. Friday 2am I pre-ordered online on T-Mobile.com an iPhone 7+ 32Gb. I wasn't able to find anything related to the trade-in process with the iPhone 6. Received a form to sign online plus a text message, delivery estmated 09/20 -10/10. Today went to a T-Mobile store to see how the trade-in will work and they told me I should have done it at the same time than the preorder and I should have seen something to click on for the trade in during the preorder ... The only solution was to cancel my current order and restart the process by putting a new one in the store. My shipping date went from end of September to 11/1 - 11/30... Quite a disappointment