Where Next for the Mobile Phone?

How the mobile industry hopes to grab its next billion customers. Is the closure for now of the Bitcoin exchange MTGox the beginning of the end for the digital currency? And, how Berlin startups are tapping into Germany's demand for strong online privacy. Rory Cellan-Jones is joined by Dominic Sunnebo from technology reserarch firm Kantar Worldpanel ComTech, and by members of the BBC Online Technology desk.