While smartphone technology has been around since the early 1990s, it was Apple's release of the iPhone in 2007 that made it cool to be "smart." Today, according to Pew Research Internet Project's January 2014 research, more than 90% of American adults have a cellphone-58% have smartphones. Others put the adoption much higher. Regardless, there is no question that the use of smartphones is on an upward spiral. Marketers have taken notice and reached out to consumers through a wide range of mobile advertising options, from pop-up ads and videos to native advertising, in-app advertising, and more.