According to a forecast by International Data Corp
., by 2015, more U.S. Internet users will access the Internet through mobile devices than through PCs or other wireline devices. As smartphones begin to outsell simpler feature phones, and as tablet sales explode, the number of mobile Internet users is expected to grow by a compound annual growth rate (CAGR) of 16.6% between 2010 and 2015. IDC forecasts that the impact of smartphone and, especially, tablet adoption will be such that the number of users accessing the Internet through PCs will first stagnate and then slowly decline. IDC expects the United States to lead the trend, followed closely by Western Europe and Japan.