That is (genuinely) a great point, but I would ask what this mobile currency is based on - the country's currency? Is it mined like bitcoin? Processing payments via mobile phone bills is a different beast than creating a new currency, IMHO...but then again, maybe I am not understanding these companies correctly. :)
you may not have heard of m-pesa - which arose out of people being able to transfer mobile minutes and then became a fully fledge mobile currency in it's own right.. as xtrumanx says (below) m-pesa is huge. you might also note that this has already happened ;-)
