Transferring from one wireless carrier to another or getting a new phone means activating your SIM card before accessing your 5G data. If you have one of the compatible Metro by T-Mobile Android ...
As a Sprint customer, your new T-Mobile SIM card either comes with a Magenta sleeve or not. The steps for activating your new T-Mobile SIM depend on which of the SIMs you got. Most likely.
but none of them involve bringing a new device to T-Mobile. For example, if you want to swap out your SIM card or add a DIGITS Talk & Text line, you will not have to pay the activation fee.