What a Nightmare! I've been trying for a week to get T-Mobile to send my Brother an unlock code for his Microsoft Lumia 640 purchased from WalMart. Was told he has met TM's requirements and they have said three times that the code has been sent out and to wait up to 24 hours but nothing happens. I have checked my ISP Graymail box to see if it got caught there & have double checked with TM to see if they sent it to the correct email address. Help???