If you enter the Stock Symbol value for your customer Account records, the Sales Cloud Mobile App will show this and hyperlink it so that it shows details from Yahoo finance. Note that adding the stock symbol value is by default done in the More Details pages (desktop UI) but could be exposed on the simplified pages by customizing the Layout - ensuring this data is completed and the mobile app has this useful feature. As shown below when you tap the ORCL hyperlink the second screen appears with detail.
Note that you can change from the seeded Yahoo finance page by changing the same Enterprise Applications setup as done for News Feeds, described below.
In the same way the mobile app has a bottom icon bar where News Feeds is available, when the stock symbol is entered. This takes the stock symbol and uses it in a URL to get the latest news feeds. Here is how this looks:
In the past the feed source configuration was controlled by Profile Option "RSS Feed Source" where a URL was entered. This changed in Release 10 and if not completed as below will result in blank pages in the mobile app (as mentioned in this forum post). Use the following configuration steps for this feature: