I have not been to Costco , going to go there in 2 hours . I ' ve contacted TMo support though , just to confirm the deal . Here ' s how they said it ' s going down I trade in my phone s 5 and costco will give me the tradein value of the phone lets say thats $ 100 . I then have to purchase my desired phone s 7 edge at full price at Costco . End of transaction at Costco . After doing this , you must submit a promotions request on the TMo website you can do this starting on nov . 25 . They will then send you a prepaid giftcard with the remaining money they owe you . PROS You are not locked into 2 year commitment . Prepaid giftcard will arrive in 68 weeks . Costco gives you $ 25 in cash card for every phone you purchase from them , as well as a portable charging pack . Their return policy is longer . Also , if you choose to return your phone at TMo , you can ' t get your old phone back that you traded in , nor any money for that tradein . Costco gives you money when you tradein your phone , so you don ' t lose your old phone for nothing . Cons You have to purchase your devices in full at Costco . At TMo , you get the phones on 2 year installment plan , so upfront all you need to pay is the tax on the phone . I will update this post later in the day when I have gone to Costco . I ' ll also answer any questions you guys have . For now , this is all the info that the TMo rep gave me . EDIT Went to multiple Costco ' s today . One had a massive wait over 3 hours line , 1 was out of stock , 1 said they were done with new customers store still had 4 hours until closing . , and one said that my phones were water damaged employee thought that since my sticker inside phone had pink parks , it was water damaged . I tried telling him that the stickers are originally like this , and water damage causes sticker to be fully pink , but he didn ' t listen . Will go again tomorrow at 9 am , I ' ll make a new post detailing my success or failure .