I just ported 4 lines from ATT to TMO. I first paid off the installment plans I had with ATT. Then requested the unlock for each device through ATT. The unlocks were completed within a couple hours from when I requested them. One of them was almost instant. I then went to a TMO store to open the account and port the lines over. The port happened instantly when the rep began the port process. The ATT service was ended and the phones displayed NO SERVICE before the rep was done with the transaction. Popped the new TMO sims in and we were off. Start to finish, this whole process took me a couple hours in the same day. After this was complete, I got on with ATT chat to close the account out. Had to do this as I still had an iPad line on the account.