1 of 1 people found this helpful
Just take your sim out of the old phone and put into the new phone and bamm... done.
1 of 2 people found this helpful
If you purchased the unlocked device from Samsung with the U1 firmware. Everything will work fine. You won't have T-Mobile Video Calling but WiFi Calling and VoLTE will work and it also has band 71.
If your SIM is fairly new, it should fit and work fine. If your SiM is older, you might require a new SIM, but more than likely not.
Our community folks mentioned some helpful tips. Did you have any other questions about using an unlocked phone?
If any issues with your SIM do crop up, you can just take it by a T-Mobile store and they'll fix you right up!