Christian Duffus realized that the extra airtime on his Kenyan SIM card couldn’t be used in the United States or redeemed online. So, in collaboration with Visa V Inc., he devised a global solut...
Christian Duffus realized that the extra airtime on his Kenyan SIM card couldn’t be used in the United States or redeemed online. So, in collaboration with Visa V Inc., he devised a global solut...