Phone and Tablet owners used to spend most of their time on the web. But things have changed and new studies have shown that they are using apps more than they use the web.
A major contributor to this growth seems to be that consumers are using their apps more frequently. So it doesn’t mean that they are on their apps for a long period of time.
Another contributor to the growth in usage, is that most websites have developed an app for their content. So users no longer have to use the standard web search to access it.