phpmaven
macrumors 68040
You will need to check with your local T-Mobile store, but any phone from any carrier that is on their list will do. It doesn't have to be a phone from your current carrier. I traded in a iPhone 4 from Sprint that I bought on CL for $80 instead of my 5S, and I was with AT&T. They have greatly expanded the list to include phones that you can pick up for dirt cheap. Also, if it's true that they are now taking dammed phones. that really makes it a no brainer to trade in soothing cheap and sell you current device.