ShapeShift Is a website where you can exchange any digital currency to another without the need to identify yourself or register.
They also have applications on Android & iOS BUT earlier, someone on Reddit told that the application vanished from the iOS App Store in the United States. Other users reported the same on their country's store after that.
Apple has by far been known for years for Its hesitance to accept digital currencies, Bitcoin wallets were allowed for the first time in mid-2014.
For now, no reason were given for this action and we still don't know If It's temporary.