oh wow. this is a revelation! (also, hitting myself for not reading the terms and conditions) this means that as long as the authorized seller is willing to take the trade-in worth $10, we're good to go. there is no way for sammy to check to see if indeed it is a "smartphone". from this, it sounds like sammy is more concerned that $200 is given to only one N4, and no so much that a particular smartphone was traded in...
my plan now. go preorder from t-mobile store. they will tell me that my prepaid account is not valid for trade-ins. i will get the smart choice $45 plan. trade-in my flip phone that is worth $21 on their site. get my N4 delivered, submit paperwork, get $179 check from sammy, then open another $30 walmart plan using a new sim, port over my number from $45 plan to walmart plan. this will cost me $15 (maybe 30) extra, but it might be the easiest way to take advantage of the promo. if anyone sees a hole in my plan, let me know