Office work is one of the most cumbersome jobs you will ever have to do. Basically, you will need to transfer documents back and forth between many units before they reach their final destination. Therefore, in the past, people who did office work often felt very annoyed. Because they did not have any tools to read the documents. But now, smartphones are extremely good. It can be used as a handheld computer. So, you can still check the documents sent right on your smartphone.