I gave tmobile the iem number for my phone that im trading in once I get my jb iphone 7 plus coming from UPS Today!! I originally had planned to trade in my iphone 6 plus but decided to trade in my wifes iphone 6 instead. Is it possible to trade in a different phone than the one I had originally told them? Has anyone done that before? Also do I ship it back using the box they sent my iphone 7 in? My wifes phone is a little more beat up and worth less so I figured it would make more sense to trade hers in. Thanks! Oh and my preorder was not suppose to ship until 11/1-11/30 but I got charged on friday, got tracking on saturday and its getting delivered today! Can't wait!