Supported in what way?
Why can't you just turn it on and use it.
What happens when you try to use it exactly?
Did you change your Apple account to Trinidad?
If so, certain things will be limited, such as access to the App Store.
You may want to keep the Apple ID set to the US for that.
Or create a new Apple ID that is set to the US for access the require that.
You can change the Apple ID used for the iTunes & App Stores in Settings>Apple ID & iCloud>Media & Purchases>Sign Out>Media & Purchases>Not [your name]
Everything else should work the same way.
If you are having a specific issue, then please explain what that is.