Hiya, magenta2285387! Congrats on your upcoming trips! You're spot on in your understanding of the phrase "US roaming" -- you wouldn't be able to use one of these SIMs to pick up partner coverage, but you'll definitely be able to pick up T-Mobile service throughout your trip! I'm not sure how light your potential data use might be, but we also offer a Tourist Plan if you want the advantage of unlimited international texting while you're here to keep in contact with folks back home! Just wanted to make sure you'd been able to take a look at that option while doing your comparison shopping.
Thanks Marissa, that's nice and clear.