Do you operate Wi-Fi networks or even hotspots? then you might want to read Gary Kim's article about iPass Exchange platform. iPass used to be like Wayport (before AT&T bought Wayport), offering global access to wi-fi hotspots for a monthly fee or a day rate. The model has shifted a little.
"The new iPass Open Mobile Exchange is a carrier-grade platform for service providers to integrate public Wi-Fi networks with 3G and 4G, allowing providers to seamlessly connect customers to preferred Wi-Fi networks, while adding the ability to support “for fee” access across different affiliated networks." [product page]