Me and my husband trade in 2 iPhone last Sep. One 6S and one 5S. We use the pre-paid label T-mobile provided and dropped it to USPS. Till now, we have not received any credit and for each month we keep paying the device fee. My husband went to the T-mobile store to see if the staff there can help us. The staff there told us our phones have been received and credit already applied to our account. So he went back to check the bills. But no credit showed on the bill. We tried to call T-mobile. The customer representative told us we should not use that label to return. What? We followed the instructions to ship back the old phones. Then came the other representative. We were told that T-mobile has not receive our 6S in their warehouse and my husband's 5S got destroyed cos he has some sort of app installed in the phone. So they just destroyed the phone with out letting us know. Me and my husband dropped our phones together. How could one received and the other got lost? And the staff in the store told us both being received. Who's telling the truth? Staff in USPS also said that is not reasonable. Now the result is we lost our old phone and "bought" 2 new phone and get trapped into T-mobile's 2 years agreement. I can not accept that result. I need to know where is my old phone and get my credit back!