Yugoslavia is in the game as I see . Not Serbia . <| sep |> If you submit the trade in online with the order , they will mail you a box to send the trade in phone back in . You have 30 days after you receive your new phone to get the trade in phone back to them . Day 1 first day that FedExUPS attempts delivery of the new phone . And although you have 30 days to get the trade in device in the mail , I would make sure you do it at least a week before that since the enhanced TIV expires at some point . If they don ' t receive the trade in phone by 30 days but you get it in the mail before 30 days are up , it could create problem , which you could get straightened out but it may take a lot of phone calls . I would get the trade in phone in the mail as soon as you are sure you are keeping your new device . For sure once the 14 day return period on the new phone is up , get the trade in device in the mail .