What’s the deal with “Cabb”?

I see those London-style cabs (“Cabb”) from time to time, and that always reminds me to see if they have an app in the App Store, but they never do. Even if I set my iPhone to the Thailand region, there doesn’t seem to be an app called “Cabb” in the app store, although I think I’ve seen them advertise it.

But there’s some kind of region-locking or something? Anybody get this to work with a phone that isn’t from here?

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