I need help finding an international phone plan?

I currently have an iPhone 7 with Sprint and I'm under a 2 year contract. I want 4G LTE Unlimited Data.
Sprint said I free unlimited 2G data internationally but I'm pretty sure that I'm better off using a brick as my phone than 2G. They said I could purchase additional speeds but they didn't specify which plans they offer and if they are unlimited.
What are my options considering I under contract with Sprint?

How much longer will Apple support the iPhone SE?

Please stick to the question ("you should buy and Android" is not an answer.)

The iPhones have a feature not available on Android that I need, and I need to run an app on a more mobile device than my tablet (Surface 3 with Windows 10). I only NEED just ONE app, but won't consider buying a phone if it doesn't have this certain Apple feature.

Other than that I really am not a smartphone fan. But my tablet is a bit too big. In fact I prefer a small basic phone, which is why I'm considering the smaller and cheaper SE. So the smaller the phone the better. I hate big phones and am also hard on phones meaning I'll need a good case, which also increases the size of the phone.

But how long is the SE going to be supported? It seems to have been on the shelves for quite some time. I'm very frugal and do not want to spend $399 on a phone that won't do it's job in a couple years. (Actually I'd rather just keep my flip phone.) If the SE is going to be dropped soon, is there another small Apple phone on the horizon? If not I might opt for a 6 or a 7. I want to pay the least amount for the longest running iPhone possible, and preferably the smallest one too.

I say this knowing that a lot of older mobile Apple devices will not update nor run the app I need. The phone has to be up-to-date.

Can you help me?

Thanks!

Added (1). The app in question has a database that must be periodically updated. It seems the iPhone s and s do not have the ability to download or update this app. Hence the concern.

How to solve Skype Login problem on iPhone?

I created a Skype account in my Macbook. I logged in there. Then I installed Skype for iPhone on my phone. I tried to login and User ID and password are correct. But I'm getting "There's a problem with your Microsoft ID and fix it.) What to do?

Previously downloaded songs unavailable now on Spotify?

I was on Spotify (I'm always logged in) and I specifically wanted to listen to "Boyz With Fun" by BTS. I have a premium account and I rarely ever have any issues with Spotify.

-When you have saved at least one song by a specific artist, the song pops up underneath the artist's name when you click on it, right?-

So I had saved every song from all of BTS' albums (no singles) and downloaded them on my iPhone, so I could listen to them when offline in public.

Just a few hours ago listening to all of their songs was really easy, but now that I'm home a few of them were greyed out.
Just a few songs from every album was unavailable, then I deleted and reinstalled the Spotify app and now only two of their albums are available for me (You Never Walk Alone and Wings) even though I have saved the other albums as well.

I don't know what to do and it's made me sad because I've gotten really into BTS lately.

DEAR IPHONE OWNERS - are you pretentious?

Okay basically i have an old and beat down android because my mother is against iphone because she says the people who buy it are pretentious. I have nothing against androids, i've used them my whole life, but my theory is that iphones appeal to my demographic - good camera, easy to text others (very hard and annoying to text iphone users with an android), you can have a lot of apps, and its just more compatible with other iphones. So, i'd just like some evidence from iphone users that they are not pretentious because they have an expensive phone. Tell me a bit about it.