According to an article from Kurzweil News, Google has begun roll out their Wallet app on the Sprint network to all Sprint Nexus S 4G phones with plans for more phones and possible other wireless networks in the future. 

As more and more people look to the internet for information, the demand for a  fast and reliable connection continues to increase.  As mentioned in an article from Kurzweil News,  global internet traffic is set to quadruple by 2015!  Here is a chart from Cisco Systems to put it into perspective: