Unless you roll it over, the unused mobile data you paid so dearly for is lost in time, like tears in ... rain. For a limited time, however, Virgin Mobile customers in Australia can transform those dead digits into phones, drones and other swag. To be sure, the "data auction" is a publicity stunt that mostly benefits Virgin, since there's but a single prize each day over the month-long promo. In addition, you have to bid all your remaining data, so you can only win once.