Comment Re:SIM tray (Score 1) 89
BUT! Even outisde of the US:
Nearly always, this only go up to 2 SIMs on the tray. (Personal experience: none of my phone ever had more).
What's the likelihood you'll need more than 2 at a time? You have your home country SIM in one slot and the country-you're-in-now SIM in the other. Unless you're someplace like Europe where you can cross multiple countries in a day's drive, this isn't likely to be a big limitation.
(FWIW, T-Mobile (in the US, at least) provides free international roaming in most of the world. I've kept their SIM in while in Mexico and the Bahamas without issue. The only country I've been to that wasn't covered was Fiji, for which I bought a SIM at the airport with a week's worth of service, put that in my phone, and stashed the stateside SIM in a safe place until I left since my phone at the time was of the more common single-SIM variety. I think a dual-SIM tray is available for my current phone (a OnePlus 7 Pro), but I'm not sure if it'll work in a phone that shipped with a single-SIM tray.)