Founded and headquartered in Tartu, Estonia, mobile payment solution provider Fortumo now also has offices in the U.S., U.K and China. After you click on a Buy button for a virtual item in an app, Fortumo would identify the SIM card in your mobile device and charge it with carrier billing. Besides Android apps, Fortumo is exploring business opportunities elsewhere in the mobile Internet market. But he doesn’t see people purchase goods for large amounts of money with carrier billing like they do online shopping on Taobao or other e-commerce sites. Or it would be Fortumo itself to shift direction if carrier billing became a minor payment method.