[maw]

Are they usable in different countries? I know that, unfortunately, some prepaid CCs issued in the US can't be used in other countries, for instance. But maybe that's less likely to be the case in Europe, or, really, just about anywhere else.

[icebraining]

Dunno about 3V, but here in Portugal we have a similar system (called MBNet) and it works fine everywhere. I do all my online shopping with it.