Waterproof Blackberry - Have You Seen?

Do you know why still it is working? The best answer which i have found is that:

Water that has had its mineral ions removed, such as cations fromsodium, calcium, iron, copper and anions such as chloride and bromidetherefor removing conductive capabilities not allowing the water tocomplete the circuit.

Here, in this video it is not obvious which water is used; what you think about this experiment?
You are welcomed to give your comments below.