Mobiles in Enterprise/Work Place

What opportunities /problems to solve exist in the workplace/enterprise that can be tackled efficiently via smartphones. What advice would you give an upcoming mobile developer wanting to avoid the consumer space which derives most revenue from advertising. As a note advertising has been constant 1% of US GDP for the past 100 years [0] or so and can't really compete with Google/Snapchat/FB. Basically opportunities to exploit for someone to make a decent living i.e >100k$ not take over the world or anything [0]: https://www.bloomberg.com/news/articles/2014-03-03/advertisings-century-of-flat-line-growth