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I believe it's just Simply Prepaid and T-Mobile ONE Prepaid plans that have the abilitly to roam internationally.
All international roaming is "short term use only" -- a majority of your usage must be on T-Mobile's network, otherwise T-Mobile can terminate you as a customer. What "majority" means hasn't fully been defined, but I would guess a couple months a year.
If your device has WiFi Calling, you can utilize that while connected to WiFi, and the rates are as if you were here in the States. Obviously doesn't help if you're out between WiFi locations trying to get around, but can be handy if you're trying to catch up with friends/family Stateside.
Thank you, very helpful!