Build an Online Store

Hi, I am from a country with three Telecom companies and a very weak banking system. I want to take advantage of Premium SMS payments in eCommerce by creating a cart that would allow the user to register and to buy and download songs, eBooks or general eCommerce goods by using Premium SMS payments and the user to be able to see his [login to view URL] prices to vary between an item and another . Magento platform is preferred.