WARNING: These phones no longer can use 5G. The V50 is a "First Gen" Sprint 5G phones. They can only anchor to 5G NSA with Band 41 LTE Anchor. In English, T-Mobile no longer does what these phones need to use 5G.
As such, regardless of Sprint, T-Mobile, or any other SIM... this phone will never be able to use 5G again. They still work fine as 4G phones, however. - Asuka, your friendly neighborhood EVA pilot.