Where is my iPhone 15 Pro Max? - My wife got hers, orded the next day!

This one does sound like a head scratcher for sure. If the make, model, and color are exactly the same, they should ship out in the order that the purchases were made. The primary factors for orders are the order system, inventory, payment, and shipping. The order system would be the same if you both were doing orders with trade-ins without new lines. The inventory, as mentioned, is in first come first serve, so logically yours would be before hers. If we have not handed your phone to UPS yet, then shipping is not a factor in this situation. That leaves us with payment and I don't see any information about that in this conversation yet. 

Did you use the same payment method for both orders? Did you get any kind of alert from T-Mobile or your bank about the payment for your order? Does it show that your card has been charged for both orders or just one? What is the status currently on your order? 

These are probably things that the other T-Mobile people already looked at when you asked about it before. Since I don't have account access, I have to ask. haha Just trying to get as much info so maybe I can glean some insights that could help.