Orange harnesses wind to power charger

Cellular network operator Orange will be showcasing its wind-powered cellphone charger next week, where the prototype will be able to harness the power of the wind in order to provide some much needed juice to exhausted batteries that are often a common occurence among cellphones these days. Of course, I suspect this will be more of a hit in Holland than anywhere else. Should there be no wind blowing my way at that point in time, am I supposed to actually huff and puff my way through a phone call? The prototype weighs 150g and can be mounted on the day, generating and storing power as long as there is some wind.