Great app !
Don't know why "region" should be an issue ?
This app answers a call after the proximity sensor is covered ! And it ends a call when shaken, again a sensor. Both are hardware so where does region come in ?
OK, all people are equal, but some are more equal than others ?
Since I don't know anything about the process of publishing an app to the Nokia Store I can't say anything about the reason.
It could be that Nokia blocks the app in some region. It could be that the developer decided that the app will be available only in some regions. Or it could be that the app just gets delayed in some regions for example because of different QA teams per region.
This is just speculation, as I said I don't know anything about the app publishing process.